How old are the twin girls?A.21 years old.B.5 years old.C.17 months old.D.5 months old.

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How old are the twin girls?

A.21 years old.

B.5 years old.

C.17 months old.

D.5 months old.

请帮忙给出正确答案和分析,谢谢!

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