Passing array dari class a ke class b

Saya punya activity form kuis (class A) yang berisi pertanyaan dan setiap pertanyaannya mengandung 2 jawab yes dan no dan setiap jawaban mengembalikan nilai yang disimpan di array. Lalu di akhir kuis tersebut array nya ingin saya passing ke class B untuk di proses dan menghasilkan nilai. Setiap kembali ke menu utama dan mengulang kuis, array akan diclear terlebih dahulu baru menyimpan elemen baru sesuai jawaban yang baru. Bagaimana cara passing array dari class A ke class B agar saat melakukan pengulangan kuis, array di class B terupdate sesuai dengan yang ada di class A?

Ini codingan class A dan B nya, saat saya debug ternyata array yang terpassing ke class B tidak terupdate/masih menyimpan array lama.

Class A

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_screening);

        toolbar_scr = findViewById(R.id.toolbarScreening);
        toolbar_scr.setTitle("Screening");

        arrayDS.clear();
        arrayFT.clear();

        countQuestion = findViewById(R.id.qNumber);
        textQuestion = findViewById(R.id.qText);
        optYes = findViewById(R.id.btnYes);
        optNo = findViewById(R.id.btnNo);

        optYes.setOnClickListener(this);
        optNo.setOnClickListener(this);

        firestore = FirebaseFirestore.getInstance();

        getQuestionList();
    }

    private void getQuestionList() {
        questionList = new ArrayList<>();

        firestore.collection("PTSDProject").document("Screening")
                .collection("Question").get().addOnCompleteListener(new
                OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()){
                    QuerySnapshot questions = task.getResult();

                    for (QueryDocumentSnapshot doc: questions){
                        questionList.add(new Question(doc.getString("textQuestion"),
                                doc.getString("optYes"),
                                doc.getString("optNo"),
                                doc.getString("group"),
                                Double.valueOf(doc.getString("valueYes"))
                        ));
                    }

                    setQuestion();

                } else {
                    Toast.makeText(ScreeningActivity.this,
                    task.getException().getMessage(), Toast.LENGTH_SHORT).show();
                }
            }
        });

    }

    private void setQuestion() {
        numQuestion = 0;

        textQuestion.setText(questionList.get(numQuestion).getTextQuestion());
        optYes.setText(questionList.get(numQuestion).getOptYes());
        optNo.setText(questionList.get(numQuestion).getOptNo());

        countQuestion.setText(String.valueOf(1) + "/" +
        String.valueOf(questionList.size()));
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btnYes:
                arrayDS.add(questionList.get(numQuestion).getValueYes());
                arrayFT.add(questionList.get(numQuestion).getValueYes());
                break;

            case R.id.btnNo:
                arrayFT.add(0.0);
                break;

            default:
        }

        changeQuestion();
        Log.d("ArrayDS", String.valueOf(arrayDS));
        Log.d("ArrayFT", String.valueOf(arrayFT));
    }

    private void changeQuestion() {
        if (numQuestion < questionList.size() - 1){

            numQuestion++;

            textQuestion.setText(questionList.get(numQuestion).getTextQuestion());
            optYes.setText(questionList.get(numQuestion).getOptYes());
            optNo.setText(questionList.get(numQuestion).getOptNo());

            countQuestion.setText(String.valueOf(numQuestion + 1) + "/" +
            String.valueOf(questionList.size()));

        } else {

            Intent intentMove = new Intent(this, ResultActivity.class);
            startActivity(intentMove);
            finish();

        }
    }

    public static ArrayList<Double> returnDataDS(){
        return (arrayDS);
    }

    public static ArrayList<Double> returnDataFT(){
        return (arrayFT);
    }

Class B private static ArrayList<Double> arrayDS = classA.returnDataDS();

private static double inferensiDS(double x, double y){ return (x * y) + (x * (1 - y) + ((1 - x) * y)); }

public static double screeningDS(){ Log.d("getDS", String.valueOf(arrayDS)); double hasilDS; if (arrayDS.size() <= 1){ hasilDS = 0; return hasilDS; } else { double temp = 0; temp = inferensiDS(arrayDS.get(0), arrayDS.get(1)); for (int i = 2; i < arrayDS.size(); i++){ temp = inferensiDS(temp, arrayDS.get(i)); }

hasilDS = temp * 100; return hasilDS; }

}