单选题

下列程序的运行结果?( )

a={6,5,4,3,2,1}

a.remove(1)

print(a)

A

{6,5,4,3,2}

B

{1,2,3,4,5}

C

{1,2,3,4,5}

D

[2,3,4,5,6]

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