Over a billion people lack access to clean drinking water, and over 2 billion people live without adequate sanitation, leading to the deaths of 5 million people, from preventable waterborne disease.

When a davit-launched raft is lowered from a ship，upon becoming waterborne，the raft is released by（）. A: activating the release lock of the hook B: pulling smartly on the knobbed cocking lanyard C: the effects of buoyancy removing the weight of the raft from the hook D: releasing the boarding flap and the bowsing line