Answer: Option (b) is the correct answer.
Explanation:
Radiation is absorbed by the ground of Earth and this heats the surroundings along with tropospheric air through conduction and convection process.
But as we go at higher altitude then gases present in the troposphere absorb very less amount of incoming solar radiations.
As a result, air molecules move farther away from each other and there will be decrease in density of air due to less heat transfer.
Thus, we can conclude that temperature decrease with higher altitude as air density is lower, so there is less heat transfer.
