Answer:
Option A , decrease
Explanation:
The pressure exerted by atmosphere reduces as one moves upward towards the sky. The reason behind this is that the heavy particles in the earth's atmosphere are found in close proximity of the earth's surface due to their heavy weight . The lighter atmospheric particle are found in the upper region of atmosphere due to their low weight and hence as one moves above the surface of earth, the atmospheric pressure reduce.
Hence, option A is correct.
