In Contrast to Interviews,self-Administered Questionnaires Have the Advantage(s)of

In contrast to interviews,self-administered questionnaires have the advantage(s) of :

A) being more effective in dealing with complicated issues
B) producing fewer incomplete questions
C) dealing with the context of social life
D) handling sensitive issues more effectively if the surveys are anonymous
E) all of these choices are advantages of self-administered questionnaires