IMO c...
B and E are impossible.
"of green fields that ..." fields is plural, surrounds is incorrect. It has to be surround.
We are left with A C and D.
"Joaquin Valley town..." is singular so should be bustles and not Bustle. So D is voted out.
A is visibly incorrect so correct answer is C, even if we do not consider who and whom issue. Also the subject in the sentence are the workers who and not whom "are in the area just for the season".
OA?