Professor Hui Didn't Bring Enough Course Evaluation Surveys to Class,so

Multiple Choice

Professor Hui didn't bring enough course evaluation surveys to class,so he distributed the surveys he had to students at the front half of the lecture hall.By doing this,he gave up one of the biggest advantages of surveys:

A) honest reports from respondents.
B) random assignment to groups.
C) the ability to collect large amounts of data.
D) random selection to ensure generalizability.
E) questions that are easily understood by respondents.