Which of the Following Is TRUE

Which of the following is TRUE?

A) In exploratory research, the major emphasis is on determining the frequency with which the phenomenon occur together, e.g. sex of driver with frequency of accidents.
B) A study aimed at making predictions such as the number of college students who are likely to go on to graduate school is an exploratory study.
C) It is generally true that in an exploratory study, cases that provide sharp contrasts or have striking features are most useful.
D) The estimation of the proportion of people who behave in a certain way, e.g. proportion of college students who smoke, is an example of an exploratory study.
E) They are all true.