Explain why sunspots are cooler than the surrounding solar surface? A. They are cooler than the surrounded region due to convection that carries cooler material downward B. They are cooler because there is less fusion occurring in that area. C. They are cooler because the magnetic fields lift material from the surface of the Sun, cooling off the material faster. D. They are cooler due to the strong magnetic fields that slow convection and prevent hot plasma from entering the region