Which of the Following Is True of Telephone Questionnaires That

Which of the following is true of telephone questionnaires that use an electronically generated voice rather than a live person?

A) Use of electronically-generated voices is superior because people do not worry about being judged,as they might when interviewed by a live person.
B) Use of electronically-generated voices is not permissible because of concerns related to privacy.
C) Because they are so difficult to understand,electronically generated voices should only be used with very simple questions.
D) Use of electronically-generated voices results in increased variability.