The iron drum filled with water is broken, twisted into strips directly with plastic bags, and the hole is stuffed on the flame for burning. After the water is boiled, the plastic will not burn. This is because the temperature is constant when the boiling point is 100℃, and the ignition point of plastic is higher than that of water, so the temperature of plastic strip will not be too high;

Therefore, AB is wrong; C is correct;

So choose C.