【单选题】According to the sentence 'They engage in many different types of diving, of which wreck, cave, commercial, and military diving are just a few.' which of the following explanations is correct?
A.
Among different types of diving, military diving is an exception.
B.
Talking about wreck, cave, commercial, and military diving, they are few.
C.
Mentioned of wreck, cave, commercial, and military diving, the people who take part in are few.
D.
People do not like wreck, cave, commercial, and military diving.