Which of the following statements explains why temperature increases with altitude in the thermosphere?
A) The air particles in the thermosphere absorb high-energy radiation from the Sun.
B) Earth's lower atmosphere is heated indirectly by longer-wavelength terrestrial re-radiation.
C) The ozone layer is located within the thermosphere, and it absorbs high-energy solar radiation.
D) Earth's lower atmosphere is heated directly by incoming short-wavelength solar radiation.