As we move upwards, the atmospheric pressure
(A) Increases
(B) Decreases
(C) Remains the same
(D) Cannot be said

Hint: Atmospheric pressure is the pressure which is exerted by the atmosphere on everything in it. We know air has weight and it exerts forces against everything it strikes. That pressure is called atmospheric pressure, or air pressure.

Complete step by step answer:
-Atmospheric pressure is the force exerted on a body by the air above it as the gravitational force of the Earth pulls itself towards the earth’s surface. Atmospheric pressure is measured using an instrument called a barometer. In a barometer, mercury is used for measurement of the pressure. The atmospheric pressure is measured in the units of atm or pascals. One atmosphere is 760 millimetres of mercury. At very high altitudes, atmospheric pressure and available oxygen become so low that people can become sick and even die in certain cases if they have a history of lung problems.
-This is because the altitude is so high that the amount of breathable oxygen is too low to breathe. Atmospheric pressure drops as altitude increases.
Thus, as we go up atmospheric pressure decreases and the correct option is (B).

Note: Contrary to this as we go deep inside the earth the pressure also increases and this increase of pressure is attributed to the rise in the temperature.