A thin paper cup filled with water does not catch fire when placed over a flame. This is because

The water cuts off oxygen supply to the paper cup.

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Water is an excellent conductor of heat.

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The paper cup does not become appreciably hotter than the water it contain.

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Paper is a poor conductor of heat.

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Solution

The correct option is C
The paper cup does not become appreciably hotter than the water it contain.

Water is an excellent conductor of heat and absorbs or uses the flames energy to evaporate. Because the paper cup cannot become appreciably hotter than the water it contains, the cup will not ignite until the water has all turned to steam and risen away.

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