Arestrictive adjective clause is . not set off with commas, set off with commas, set off with semi-colons, set off with brackets.

A restrictive adjective clause is not set off with commas

Explanation:

Adjective clauses are dependent clauses whose function is to modify or describe nouns. They can be either restrictive or nonrestrictive. When they're nonrestrictive, they contain information that is not essential to the sentence, meaning that without it, the sentence would still make complete sense. When these types of clauses are placed in the middle of a sentence, they're set off with commas, and when they're placed at the end of the sentence, they're followed by a comma.

A restrictive clause, on the other hand, is one that is never set off by commas because its content is essential to the meaning of the sentence: without it, the sentence would seem incomplete, unspecific, vague or would have a different meaning. An example of a sentence containing a restrictive adjective clause: The doctor who attended me last week is sick.

answer; (b); the abolitionist movement;

"a" because he is appealing to logic as oppose to appealing to the audience's emotions.