Change of Voice - Verbal and Reasoning

Directions to SolveIn the questions below the sentences have been given in Active/Passive voice. From the given alternatives, choose the one which best expresses the given sentence in Passive/Active voice.
Q1:

A child could not have done this mischief.

A This mischief could not be done by a child.

B This mischief could not been done by a child.

C This mischief could not have been done by a child.

D This mischief a child could not have been done.

ANS:C - This mischief could not have been done by a child.

No answer description is available.