B. It gets the audience to start thinking about whether the Declaration of Independence was beneficial for the slaves.
Explanation:
According to the Declaration of Independence, <em>all men were created equal. </em>However, if all men were created equal, what is the explanation for the existence of slaves? Slaves were not equal; they were not even considered fully human, but rather only three fifths of a man. They did not have the same rights (or any rights for that matter) as the white man; they had to work for no salary or else they would be killed; they were disposable for the white man.
So through his series of questions he is trying to make his readers realize that, although quite beneficial for white people, the Declaration of Independence was in no way beneficial for slaves as well.
