单选题

有如下两行代码,请问代码运行之后,打印出的结果是?(    )

a = [1,2,3,4,3,2,3,4,2,1,4]

print(list(set(a)))

A

[1,2,3,4,3,2,3,4,2,1,4]

B

{[1,2,3,4,3,2,3,4,2,1,4]}

C

{[1,2,3,4]}

D

[1,2,3,4]

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