Which of the Following Is a Guideline That Should Be

Which of the following is a guideline that should be used in a questionnaire introduction?

A) Reassure the respondent with the statement that "All of your data will remain anonymous" even when this is not the case.
B) Inform the consumer that their information will be kept anonymous but that the marketing research company must remain confidential so as not to bias the data.
C) Always provide an honorarium or incentive of some sort during the introduction, even if it is very small.
D) Reassure the respondent with a statement such as "There are no right or wrong answers, so please give thoughtful and honest answers to each question."
E) Tell the respondents that the marketing research study will be short as they will not want to participate in a longer study.