I would say the correct answer is B. primitive man.
The point of the entire novel is that Buck is fighting his urges to go to the wilderness and succumb to his wild identity of a wolf. Thus, dreaming about the primitive man clearly portrays his struggle between his two identities, that of a domesticated dog and that of a wild wolf.
Answer:
A.Better
Explanation:
Better in this sentence is referred to the word must or "have to" therefore, the correct grammar is indeed A.
