90. 下面 Python 程式碼的輸出為何？
```python
x = [1, 2, 3]
y = x
y.append(4)
print(x)
(A)[1, 2, 3]
(B)[1, 2, 3, 4]
(C)[1, 2]
(D)None
```

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統計： A(0), B(1), C(0), D(0), E(0) #3927574