At which of the places listed would you expect to experience the lowest air pressure?
a. in an underground cave
b. on a sailboat way out in the ocean
c. in a valley
d. in a hot-air balloon high in the sky

In an underground cave. With hardly an air at all. Hope it helps!

P.S. Will you mark me brainliest if I'm right please?

D. In a hot air balloon high in the sky

Explanation:

Ap ex

answer; /// i believe that the correct answer is (a) making presentations;

what he said above me         look up that's the answer