In the following question, a sentence has been given in Active/Passive voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice.
I have kept all your old letters.

Options

A. a) Keeping of all your old letters has been done by me.
B. b) I keep your letters which have become old.
C. c) Your letters which have become old would be kept by me.
D. d) All your old letters have been kept by me.

Answer

A, B, C, D