Final answer:
The subject of this question is Mathematics, and the answer explains how to compare two choices and determine the correct answer.
Step-by-step explanation:
The subject of this question is Mathematics. The question pertains to making a comparison between two choices, D and B, and determining which one is a better answer. The explanation given states that choice B is not as good because it lacks important information required for a reasonable inference. Therefore, choice D is the correct answer.