Correct Answer: Exosphere

Solution : The correct answer is the Exosphere.

Temperature increases rapidly in the exosphere. Earth's atmosphere is divided into various layers depending upon the temperature changes. They are the troposphere, the stratosphere, the mesosphere and the thermosphere. In the troposphere, temperature decreases with height, while in the stratosphere, it increases. In the mesosphere, temperature decreases again. In the thermosphere, temperature increases. Finally, in the exosphere, temperature increases rapidly.