The correct option is C cover the person with a woolen blanket.
If a person's clothes catch fire, the best way to extinguish the fire is to cover the person with a woolen blanket. By covering with a blanket, the supply of oxygen is stopped which is a supporter of combustion.
Throwing water on them is not a suitable thing if the fire has been caused due to electricity.
Polythene sheets catch fire, and it will be dangerous.
Fire extinguisher can’t be used as it may cause breathing problems.