If this argument is flawed, it’s the wrong flaw. (A) is about an objective fact: whether Alice completed her assignment. By contrast, the stimulus is about a subjective claim.

This is a valid argument, unlike the stimulus. Whether Morris saw the fire is an objective question, one for which (B) gives relevant evidence. By contrast, the flaw in the stimulus is using external evidence to evaluate a subjective claim.

This is the wrong flaw. (C) relies on testimony from someone else about Denise’s thoughts. By contrast, the testimony cited in the stimulus was about the critics’ own thoughts, not Donna’s thoughts.

(D) concludes that Loren’s subjective claim (that she enjoyed the taste of the fish) is false. The reasoning is that it conflicts with the subjective claims made by others (foodies who hate the taste of the fish). This is flawed, because other people’s experiences aren’t relevant to Loren’s subjective claim.

This parallels the flaw in the stimulus: relying on the critics’ subjective experiences to contradict Donna’s subjective claim.

This is a valid argument, unlike the stimulus. Whether Douglas climbed the tallest mountain in the country is an objectively answerable question. By contrast, which art exhibit Donna found most interesting is not.