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.

Which character is mainly focused on in to kill a mockingbird?

The institute of international research is holding its annual convention. this year more than 500 scholars have been invited to hear research reports on many timely topics. approximately 250 big name scientists will be winging their way to washington, d.c. how can the underlined sentence be revised so that it fits the tone of the passage? a) approximately 250 people will be in washington, d.c. b) approximately 250 bigwigs will be flying to washington, d.c. c) approximately 250 science people will be going to washington, d.c. d) approximately 250 well-known scientists will be arriving in washington, d.c.

"introduction to oedipus the king": what is most likely the author's intent in writing about the difference(s) between sophocles's play and the original myth on which it's based?