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.
The correct answer is B. "The Wind Gives Life"
That answer fits best the excerpt that you didn't provide, but was quite common among students who asked the same question.
It was long and narrow so you were closer to land as where in the Atlantic Ocean it is miles before you'll see land.
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i'm pretty sure the answer is satire based on the fact its almost using humor to explain this bad situation the girl is in. :)
Explanation: