Which of the following is not recommended for prompting returns of mailed questionnaires?

Which of the following is not recommended for prompting returns of mailed questionnaires?
 
  a. Include a cover letter explaining the purpose of the study
  b. Ask questions the respondent will view as being significant.
  c. Select respondents who are not personally involved in the matter being surveyed.
  d. Request the questionnaire be returned by a particular date.

Ques. 2

The ongoing relationship between educational psychology research and practice is most like
 
  a. building a sand castle at the water's edge.
  b. building a skyscraper.
  c. driving a car.
  d. writing a novel.