Question

Which sentence correctly uses the possessive form

A. The Chairman of the Boards microphone was turned off, so we could not hear what he said.
B. The Chairman's of the Boards microphone was turned off, so we could not hear what he said.
C. The Chairman of the Board's microphone was turned off, so we could not hear what he said.
D. The Chairman of the Boards' microphone was turned off, so we could not hear what he said.

Answer 1

C. The Chairman of the Board's microphone was turned off, so we could not hear what he said.

Answer 2

The answer is C
Answer A is showing more than one chairman of the board, and answer B is just wrong. Answer D is showing more than one chairman of the board has posession of the microphone, but the sentence indicates that there is only one chairman of the board, so therefore, the answer C is the one you want because it is showing singular possession of the microphone