Final answer:
Paper fires, which is option C, can be put out with water because water lowers the temperature and prevents the fire from maintaining combustion without reacting dangerously with the burning substance.
Step-by-step explanation:
The type of fire that can be put out with water is a paper fire, option C. Water can effectively extinguish a paper fire because paper is a combustible material that doesn't produce a hazardous reaction when it interacts with water. Using water to extinguish flames caused by burning paper can lower the temperature of the fire and remove the heating element necessary to maintain combustion. Consequently, water soaks into the paper, thus reducing its ability to react with oxygen.
In contrast, throwing water on grease fires (like a burning oil pan), electrical fires, or chemical fires can be dangerous. Water can cause a grease fire to spread because the grease can float on the water and carry fire with it. For electrical fires, water is a good conductor of electricity, and using it can lead to electrocution or even spreading the fire further. Chemical fires may involve substances that react violently with water, potentially causing an explosion or releasing toxic gases.