In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one, which best expresses the same sentence in Passive/Active voice.
The professor always answers my questions.

A

My questions were always answered by the professor.

B

My questions are always answered by the professor.

C

My questions were always being answered by the professor.

D

My questions had always been answered by the professor.