Answer: a. weak analogy
The fallacy of weak analogy occurs when an argument compares two things that are not really comparable, or that are not really alike. It is a common type of fallacious thinking, and it can be very persuasive despite its lack of merit. In this case, the author is comparing the situation of the North with that of the South. However, he misrepresents them, and compares them in an inaccurate way.