Answer:
A. The Sun heats the atmosphere unevenly, so temperatures and pressures are constantly equalizing.
Step-by-step explanation:
Solar energy is the most important force that stands as responsible for the occurrence of all the atmospheric changes on the Earth. The solar energy is received and reflected back by the earth's surface. The amount of solar energy is responsible for the occurrence of the water cycle, formation of the clouds, presence of humidity in the atmosphere. The Earth's temperature is maintained when the reradiated solar energy is absorbed by other gases.