Explanation:
relative clause
it modifies noun phrase by some grammatical tools
example
my friend who is coming from America is coming to the dinner
here who is used to indicate the noun phrase
subject verb agreement
A subject and a verb must agree, even when other words or phrases come between them.
example
The flock of geese is flying south for the winter.
The subject is flock, so the verb should be is flying.
False. if you don't go into detail you won't have the best description
I believe is the answer is A. Senator Hillary Clinton.
The answer here is probably B, but you didn’t provide the text so I can’t be sure.