The correct answer is C) warming exposed parts rapidly. The reasoning behind this is that frostbite is a condition caused by exposure to extreme cold, which can damage the skin and underlying tissues. To treat frostbite, the recommended approach is to warm the affected area rapidly, as this helps restore blood flow and prevent further tissue damage. Rubbing the area briskly (option A) or with ice/snow (option D) can actually further damage the skin, while wrapping in warm cloths (option B) may not provide the necessary rapid warming.