Dr Barnes Is Interested in the Sexual Behavior of Middle-Aged

Dr. Barnes is interested in the sexual behavior of middle-aged adults. She goes to a large corporation and collects data on all clerical workers who meet this criterion. Dr. Barnes calls her study "The Sexual Behavior of Middle-Aged American Workers." Dr. Barnes' study can be criticized on the grounds that

A) she has not followed standard ethical guidelines satisfactorily.
B) the findings are not based on a representative sample and are biased.
C) experimentation would have been a better methodology for this study.
D) her study suffers from ethnocentrism.