Answer: a) Top of Mt. Everest (29,028ft)
Step-by-step explanation:
Since pessure decreases with increase in altitude, the Top of Mt. Everest would have the lowest air pressure owing to its high altitude of 29,028ft which is higher than the rest options.
The pressure at any level in the atmosphere is measured as the total weight of the air above a particular unit area at any elevation. At higher elevations or altitude, there are fewer air molecules above a given surface compared to a similar surface at lower level.