单选题

以下程序的输出结果是?( )  

 ls = [1,2,3] 

 lt = [4,5,6]  

 print(ls+lt)

A

[1,2,3,4,5,6]

B

[1,2,3,[4,5,6]]

C

[4,5,6]

D

[5,7,9]

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