OE for reference:
Overview:The letter writer concludes that Judge Mosston should not be forced to resign and offers two considerations that, taken together, are supposed to support that conclusion. First, within the circle of people he plays cards with, Judge Mosston has always shown himself to be fair. Second, the judicial system cannot afford to spare any just and fair judges.
The Correct Answer:C The letter writer's main conclusion is based in part on the premise that the judicial system cannot afford to lose any just and fair judges. As mentioned in the "Overview," in order for this premise to support the main conclusion, the letter writer must infer from the other premise—that within the circle of people he plays cards with, Judge Mosston has shown himself to be fair—that Mosston is a just and fair judge. So the letter writer has inferred a conclusion about Judge Mosston's professional competence based on his behavior within a circle of people who play cards together. But a person's behavior in a circle of cardplayers is an extremely narrow, and thus unrepresentative, sample of that person's behavior. In particular, it is not a reliable indicator of how that person discharges his or her professional duties. (C) describes this weakness.
The Incorrect Answer Choices:A The reasoning in the letter relates what might be called a responsibility of private citizens—to be fair when playing cards—to a duty specific to a certain legal professional—for a judge to be just and fair in judging a case. But even though the reasoning relies on a questionable inference from the first of these to the second, there is no indication that it confuses the two.
B The reasoning in the letter treats "fair" and "just" as distinguishable attributes of judges, but it does not insist on drawing a specific distinction between them. Therefore, with respect to the letter writer's reasoning, the question of whether a particular distinction between "fair" and "just" can be plausibly maintained does not arise.
D The letter writer's conclusion is not based on an attempt to minimize the crime of assault by comparing it to winning or losing at cards. Instead, the conclusion is based on a claim that Judge Mosston is a just and fair judge, as revealed by his behavior as a cardplayer. That is, the issue of card playing is introduced to argue that Judge Mosston is just and fair, not to minimize the seriousness of Judge Mosston's crime. Since the reasoning does not make the comparison that (D) describes, it is not vulnerable to criticism on that point.
E To the extent that there is something like "popular opinion" involved here, it is the opinion of the letter writer's fellow citizens, and their opinion is that Judge Mosston should be forced to resign. The argument, far from basing its conclusion on that opinion, draws a conclusion that is directly opposed to that opinion. So the reasoning in the letter is not vulnerable to the criticism in (E).