Neither the teacher nor the student gives any indication of whether writing stories with anonymous sources is a common or rare practice among journalists. For (A) to be right, you must be able to point out the marginal journalistic practice, then point to the place where the student thinks that practice is actually the primary thing journalists do.

This captures the necessity vs. sufficiency flaw using “there could be other stuff too” language.

The teacher gave a list of three conditions, and said meeting one of those conditions is necessary for a story to get published. The student took that to mean stories that meet those conditions are guaranteed to get published, ignoring the possibility that there may be other necessary conditions aside from those the teacher mentioned.

Like, you know, not being made up.

(C) mirrors some language from the teacher’s statement, but for (C) to be right you must be able to point out where the student considers some characteristics of reported statements (those would be plausibility, originality, and interest) and then attempts to apply those characteristics to the situations in which they were made (so like… “[this political moment] is original” or “[my struggling corn fields] are plausible”). That last bit is where (C) collapses.

The teacher’s position doesn’t apply to invented stories. The student thinks it applies, but only because they’ve misunderstood the teacher’s position, interpreting necessary factors as sufficient factors.

(E) translated: just because meeting all three factors suffices, that doesn’t mean meeting just one of those factors suffices.

(E) itself mischaracterizes the teacher’s position. The teacher doesn’t say meeting all three factors suffices – they say meeting one of those factors is necessary.