What have you been doing lately，Molly？（）A.Not bad. B.I was at home. C.See you later.

What have you been doing lately，Molly？（）A.Not bad. B.I was at home. C.See you later.

The question asks "What have you been doing lately, Molly?" which requires a response about recent activities. Let's analyze the options:

A. Not bad. This is a common reply to "How are you?" but doesn't answer what Molly has been doing.

B. I was at home. This directly addresses recent activities, using past tense to describe where Molly has been.

C. See you later. This is a farewell phrase, unrelated to the question.

Answer: B