8. In order to assess the opinion of students at the University of Minnesota about snow removal from the campus sidewalks, at the start of the 2nd semester, a reporter for the student newspaper interviews the first 37 students he meets on campus. In this case, the most significant influence that causes doubt on the results of this survey is: A) 37 students is a small sample size B) Response bias, since the reporter may have been shivering C) There is a potential for a placebo effect D) Non-response bias, since some students may have been unable to make it to campus E) There are no significant issues