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?" suffers from the problem of a question that

A) respondents cannot easily or accurately answer.
B) 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.