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.
Mother filled dark filtered coffee in the cup.

A

The cup was filled with dark filtered coffee by mother.

B

Mother filled in the cup coffee which was dark and filtered.

C

The cup was being filled by mother with dark filtered coffee.

D

The filtered coffee which was dark was filled into the cup by mother.