DrMuntz Studies Sexual Behaviour

Dr.Muntz studies sexual behaviour.She gathers much or her data from questionnaires.Why does she use this method?

A) They are less expensive than a clinical interview.
B) There are so many aspects to sexuality it is easier to keep all the information organized if a questionnaire is used.
C) More sexual therapists are also conducting research and the questionnaires help with the research.
D) Individuals are more willing to reveal personal information on a questionnaire than in an interview.