单选题

运行如下 Python 代码,其输出是( )

a = (1, 2) 

b = (3, 4) 

a = a + b 

print(a) 

A

1, 2

B

(1, 2)

C

(1, 2, 3, 4)

D

1, 2, 3, 4 

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