A. It provides oxygen to a drowning person
B. It increases the volume of the person to keep him afloat
C. It decreases the volume of the person to keep him afloat
D. The person can sit on it like a raft
Answer: Option B
A. It provides oxygen to a drowning person
B. It increases the volume of the person to keep him afloat
C. It decreases the volume of the person to keep him afloat
D. The person can sit on it like a raft
Answer: Option B
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