“In times of heavy weather, it is extremely dangerous if manning is very short” This sentence means （）.

A、A.In times of heavy weather, it is extremely dangerous if a seaman is not enough tall

B、B.In times of heavy weather, it is extremely dangerous if a crew is very short

C、C.In case of bad weather, it is particularly dangerous if there is a shortage in personnel

D、D.In case of bad weather, it is particularly dangerous if there are enough personnel