Mountaineers carry oxygen cylinders with them because

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There is no oxygen in high mountains

There is a deficiency of oxygen in mountains due to high altitude

Oxygen is used for cooking

Oxygen keeps them warm at low-temperature

answer is B.

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Detailed Solution

Mountaineers carry oxygen cylinders with them because there is a deficiency of oxygen on mountains due to high altitude.
Low atmospheric pressure makes the air dense. The mountains are at high altitudes. At high altitudes, the atmospheric pressure reduces which makes the air dense. Also, the amount of oxygen level in the atmospheric air reduces which causes dizziness. This is why mountaineers carry oxygen cylinders with them.

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