Answer:
Option (3)
Explanation:
The environmental lapse rate usually refers to the rate at which there occur changes in the atmospheric temperature with respect to the changing elevation. The atmosphere is somewhat static, it is neither rising nor sinking, on average, so this lapse rate in the environment would comparatively different than the dry or moist adiabatic lapse rates.
At night, the air present in the lower elevation or near the surfaces cools at a faster rate in comparison to the air that is at a higher altitude, so the lapse rate typically decreases at night.
Hence, the correct answer is option (3).
