Which of the Following Is TRUE

Which of the following is TRUE?

A) A "filter" question can be used to determine if a questionnaire respondent is familiar with a certain topic.
B) Any questionnaire response is a good response.
C) Telescoping error refers to the fact that people tend to remember only events that have occurred rather recently.
D) An optimal reference period used for framing questions is about one year.
E) All of the above are false.