Answer:
Polarization is the process that causes neutral parties to take sides in a conflict. It also causes individuals on either side of the conflict to take increasingly extreme positions that are more and more opposed to each other.
#carryonlearning
Answer:
Since there aren't any options to choose from, I'd say another manual that is more recent.
(C) it shows how much opposition has he Freedom Riders faced in the south.
I believe it's antecedent. There's no commas anywhere so it shouldn't be an appositive phrase.