(E) says, "the rejection of a theoretical explanation"
The problem with (E) is that Anson isn't rejecting a theoretical explanation. In fact, Anson's explanation for why Dr. Ladlow is not a responsible psychologist is actually theoretical, as he describes a theoretical explanation or how responsible psychologists act. He uses this theoretical explanation and applies it to the case of Dr. Ladlow to demonstrate that he's irresponsible. Thus, (E) is incorrect.
(B) says, "the application of a general principle"
Anson uses a general principle in his argument to support his conclusion that Dr. Ladlow isn't a responsible psychologist. He defines what a responsible psychologist is by using a general principle. He shows that Dr. Ladlow doesn't fit into the definition of a responsible psychologist, and therefore concludes that Dr. Ladlow isn't a responsible psychologist. Anson's argument is built around his application of the general principle he cites to support his conclusion. This is the correct answer.
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