I don't see how of the answer choices must be true for this question.

Hi Farnoush, Answer choice E is essentially a restatement of the second sentence. The second sentence tells us that Most artists hold less insightful views than any reasonably well educated non-artist. This means that over half of artists are less insightful than any well-educated non artist. Because this is true for more than half of them, we can be sure that there are at least some (and indeed we know it's more than half, not just a few) artists who are less insightful than reasonably well educated non artists. So, we can infer that at least some have this quality, since we know that most of them do.

The passage contradicts the answer, why is that?

Are you saying that the passage contradicts E? What does the passage say that disproves E?

The prompt says "Most artists hold less insightful views than any reasonably well educated non-artist." This can be translated to "Most artists are less politically insightful than any reasonably well educated non-artist." Using the quantifier rule, this implies that "Some artists are less politically insightful than any reasonably well educated non-artist." The answer choice E says "Some artists are *no less* politically insightful than some reasonably well-educated persons who are not artists" In order order for this choice to be unequivocally true, you would need a statement that at least one artist is at least as politically insightful as a reasonably well-educated person who is not an artist. "Most artists are less politically insightful..." and "Some artists are less politically insightful..." could also be a reference to "All artists are less politically insightful...". There's no real way to know unless there is more information. "Most are A" does not imply that "some are ~A." The instructor is correct in saying that there isn't a contradiction, but an extra sentence in the prompt would motivate the answer.