Which of the Following Is the Major Criticism Against Masters

Which of the following is the major criticism against Masters and Johnson studies?

A) Their subjects mainly consisted of perverts such as homosexuals and failed to account for the heterosexual population.
B) Their studies generally ignored ethnic diversity and did not consider that culture had a major influence on sexual life.
C) Their subjects were heterosexuals and they generally ignored homosexuals and bisexuals.
D) Most of their subjects were men and this made the study a lopsided one that ignored one half of the population.
E) Most of their subjects were aware that they were being watched and changed how they engaged in sex.