A is better because both responses are messy, but B seems to make a more serious mathematical mistake in part (a). Since the guidelines prioritize factuality over presentation, A is more acceptable despite its much worse formatting.

Response A proves superior since while both answers contain disorganized presentation, response B appears to contain a more significant mathematical error in section (a). Given that the evaluation criteria place factual accuracy above formatting quality, A becomes the preferable choice even though its presentation is considerably more poorly structured.