题目解析：
教授说在决定去哪所学校时，有必要先确定对其师资水平的评价。因此正确答案是B。她和学生都提到了研究生专业的规模，但是并不认为这是需要考虑的最重要事项，因此A选项错误。
【对应原文】
--Well, what do you think's the most important thing to consider when choosing a grad program?
--Hmm...lt's really important to think about the faculty at the school you end up going to. You need to make sure the teachers have a good reputation, that's for sure.
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