Which of the Following Is TRUE

Which of the following is TRUE?

A) An advantage of scales is that a great deal of information can be secured from the respondent in a short period of time.
B) Item nonresponse is the group of respondents who refuse to participate in the survey being conducted.
C) Once a good set of questions has been developed,it is of little consequence as to the order they are asked on the questionnaire.
D) Both a and b.
E) a,b,and c.