“In times of heavy weather, it is extremely dangerous if manning is very short” This sentence means （）.
A. In times of heavy weather, it is extremely dangerous if a seaman is not enough tall
B. In times of heavy weather, it is extremely dangerous if a crew is very short
C. In case of bad weather, it is particularly dangerous if there is a shortage in personnel
D. In case of bad weather, it is particularly dangerous if there are enough personnel
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