In Questionnaire Design, a Question Such as "What Many Minutes

In questionnaire design, a question such as "What many minutes did you spend waiting on line at the grocery store last week?"

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.