Which of the Following Statements Concerning Response Errors Is FALSE

Which of the following statements concerning response errors is FALSE?

A) Respondents who understand a question may not always provide a truthful answer to the question.
B) It is possible that a respondent may understand a question correctly but not actually know the answer to the question.
C) Providing a "don't know" response category will often create difficulties in data analysis.
D) Pre-testing the questionnaire with members of the relevant population is generally not effective at eliminating problems due to respondents misunderstanding questionnaire items.
E) All of the above statements are true.