Earth's Stratosphere Is Warmer Than the Layers Above and Below

Earth's stratosphere is warmer than the layers above and below it because:

A) the methane released when we burn fossil fuel collects in this layer and absorbs infrared light.
B) warm air heated by contact with the ground rises into the stratosphere and heats it.
C) ozone in the stratosphere absorbs specific wavelengths of ultraviolet radiation from the Sun.
D) carbon dioxide in the stratosphere absorbs infrared light radiated outward by the ground.