Is this correct?

Solution: 
Method I is incorrect because in that case entire building is a combustible substance and we cannot remove the entire building.

Method II is correct because water can stop the fire caused due to wood or paper and as these things are not able to conduct electricity that's why it is safe to use water in this case.

Carbon dioxide gas is heavier than oxygen gas that's why the third method is also incorrect.

Hence, the correct option is (b).

 

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