According to the second paragraph, in the...

Câu hỏi: According to the second paragraph, in the 1950s and early 1960s, recreational scuba diving was a sport limited because _______.

A divers did not like to take part in any intensive training courses

B there were not any intensive training courses for divers

C there were not enough kit for many divers

D kit and intensive training were too expensive for many people to afford