RESEARCH STUDY 12.1 Dr. Fletcher Is Interested in Whether Joining a Fraternity/sorority Causes

RESEARCH STUDY 12.1
Dr. Fletcher is interested in whether joining a fraternity/sorority causes people to become more concerned about their attractiveness and appearance. He recruits a group of 55 freshmen (25 males, 30 females) who are planning to go through fraternity/sorority recruitment on his campus. After they join, he gives them a measure of attractiveness/appearance concern (the Body Concern Scale) .
-Refer to Research Study 12.1 above to answer the following question. If Dr.Fletcher is interested in a causal relationship between joining a fraternity/sorority and attractiveness/appearance concern,why doesn't he conduct a true experiment?

A) Because it is not possible to study private organizations, like fraternities/sororities
B) Because it is not possible to measure body concern
C) Because he was unable to recruit more people
D) Because he was unable to recruit an equal number of males and females
E) Because he was unable to randomly assign participants to join a fraternity/sorority