单选题 Student should evaluate their instructors ______.

A、 by discussing opinions with classmates
B、 by rating the instructor's interest in students' problem
C、 by discussing opinions with instructors
D、 by rating instructor's humorous remarks

【正确答案】 B

【答案解析】解析：由第一段中的“We are supposed to judge their lectures, interest in students' problems, methods of assigning work, and general ability to conduct a class”可知答案。