【单选题】According to the following sentences, which is the most suitable definition on diving?
A.
Diving (underwater), act of entering water and remaining below the surface to explore, to work, or simply to have fun.
B.
Diving (underwater), act of exploring water below the surface.
C.
Diving (underwater), act of jumping into the water, the most common form. of diving is sport diving, or recreational diving.
D.
Diving (underwater), act of going into water and remaining above the surface to explore, to work, or simply to have fun.