Studies on Date Rape Usually Yield Quite High Estimates

Studies on date rape usually yield quite high estimates. Which of the following issues contributes to these elevated numbers?

A) many estimates are based on "lifetime" occurrences or span several years
B) failure to distinguish "date rape" from "sexual coercion"
C) most study groups are confined to college students or other select groups
D) some respondents whom researchers regard as victims did not see themselves as victims
E) all of the above contribute to elevated counts