The correct answer is C) Drinking plenty of a commercial beverage consisting of water, salt, and carbohydrates. The reasoning behind this is that working in a hot engine room can lead to heat exhaustion, which is caused by dehydration and electrolyte depletion. Commercial beverages with water, salt, and carbohydrates (such as sports drinks) help replenish the fluids and electrolytes lost through sweating, which is the best protection against heat exhaustion in this scenario. The other options are incorrect because: A) drinking plain water alone does not replace lost electrolytes; B) taking salt tablets without sufficient water intake can be dangerous; and D) caffeinated beverages like iced tea can actually contribute to dehydration.