In the Northern Hemisphere，the right half of the storm is known as the dangerous semicircle because（）.

A.the wind speed is greater here since the wind is traveling in the same general direction as the storm's track

B.the direction of the wind and seas might carry a vessel into the path of the storm

C.the seas are higher because of greater wind speed

D.All of the above

GIV配备了几个观察员座椅？

A、0

B、1

C、2