The correct answer is D. 1
Explanation
Atmospheric pressure is a physical force that air from the atmosphere exerts on the earth's surface. This force is related to density because it decreases as height increases. Therefore, when atmospheric pressure is measured, the density of the air is important, in the lower altitude areas the air density increases and the atmospheric pressure increases, while in the higher altitude areas the air density and the atmospheric pressure decreases. Therefore, in the image that shows three mountains and a plain, the place with the lowest atmospheric pressure is 1.
