Jafar Conducted an Experiment with Student Participants Enrolled in His

Multiple Choice

Jafar conducted an experiment with student participants enrolled in his PSY 101 class.He investigated their reactions to advertisements that used humor.When analyzing his results, he should take into account that

A) there are likely to be many confounds in his methodology, so his results may not be reliable.
B) by using random assignment of participants to groups, it is likely that he avoided selection bias.
C) he has a convenience sample and may not be able to generalize his findings to the larger population of adults.
D) self-report methods are not an accurate way to get authentic reactions to the advertisements.