The Dark-Colored Belts on Jupiter Are Brighter Than the Surrounding

The dark-colored belts on Jupiter are brighter than the surrounding regions when viewed in infrared or heat radiation because:

A) chemical reactions causing the dark, visible colors also release energy and heat these regions.
B) these regions are composed of hot dust and gases released from volcanoes and distributed around the planet by high winds.
C) these regions are higher in Jupiter atmosphere, receive more sunlight, and hence are hotter in IR radiation.
D) these regions are deeper and therefore hotter layers of gas in Jupiter's atmosphere.