Which of the Following Is TRUE

Multiple Choice

Which of the following is TRUE?

A) The percentage of not-at-homes has been decreasing for a long time.
B) Answering machines help interviewers schedule callback times.
C) It is much easier to find a "responsible adult" at home than a specific respondent.
D) One to two calls are often needed to reach three-fourths of the sample of households.
E) To maintain consistency, callbacks should be made at the same time as the original call.