One Seemingly Amazing Aspect of Masters and Johnson's Research Program

One seemingly amazing aspect of Masters and Johnson's research program concerning human sexual response was ________.

A) their ability to get senior citizens to volunteer as subjects in the first studies
B) that the study was funded by churches open to discovering ways to prevent masturbation
C) that they were able to convince the press to keep the research secret for a long period of time
D) they were able to convince people to participate without offering any payment or other form of compensation