If You Were Going to Ask a Question About a Highly

If you were going to ask a question about a highly sensitive topic (e.g., masturbation, homosexuality, extramarital affairs) , where should you place it in a survey?

A) as the very first question
B) mixed somewhere among unrelated questions in the middle
C) always the absolute last question
D) among the last questions, unless it fits into a set of similar questions; then with similar questions
E) such questions are never asked in survey research