Some Topics May Be Interesting and Important,but Gaining Access to the Population

Multiple Choice

Some topics may be interesting and important,but gaining access to the population may be very difficult.Which of the following presents the greatest obstacles?

A) college students living in a dormitory
B) individuals who are members of a bowling league
C) children who are hospitalized for minor illness
D) individuals who are members of a secret cult
E) singles who go on a singles' cruise