Concept:Hot objects emit thermal radiation chiefly in the form of infrared rays.Explanation:All hot bodies radiate heat as electromagnetic waves.This radiation lies mostly in the infrared region of the electromagnetic spectrum.When infrared rays fall on the skin, they are absorbed and produce the sensation of warmth.This is why we feel heat when we stand near a hot object like a fire or an iron.X-rays, light energy, and solar energy are not the primary heat radiated by ordinary hot objects.Answer:C. infrared rays