Select the correct passive form of the given sentence.
Bill Gates has given away twenty seven percent of his wealth in charity.

A

Bill Gates has been given away by twenty seven percent of his wealth in charity.

B

Twenty seven percent of his wealth has given away Bill Gates in charity.

C

Twenty seven percent of his wealth has been given away by Bill Gates in charity.

D

Twenty seven percent of his wealth had been given away by Bill Gates in charity.