Mark the letter A, B, C, or D on you...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
What she does in her free time does not concern me.

A. What she does in her free time is none of my business.

B. What she does in her free time is not my concern.

C. I don't know what she does in her free time.

D. What she does in her free time is not concerned by me.