In Questionnaire Design,a Question Such as "When Was the First

In questionnaire design,a question such as "When was the first time you went to a dentist?"

A) is a question that respondents cannot easily or accurately answer.
B) is a question that respondents are reluctant to answer because the information is sensitive.
C) leads respondents to a particular response.
D) asks two questions at once.
E) is complex and something respondents may be unfamiliar with.