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

Multiple Choice

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. In addition to measuring the body concern of the participants who joined a fraternity/sorority both immediately before and immediately after they join,Dr.Fletcher measures them for the three weeks before and the three weeks after.This type of design would be able to better address which of the following threats to internal validity?

A) Placebo effect
B) History
C) Selection-history
D) Experimenter bias
E) None of the above