How does a human and scuba gear interact

Scuba diving is a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus, or scuba gear, which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers.

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answer: the answer is b