A student drank a bottle of water during a car ride up a mountain. At the top of the mountain, the student capped the plastic bottle. During the drive back down the mountain, what might happen to the bottle?
A) It will expand because the air is lower at the bottom of the mountain.
B) It will contract because the air pressure is higher at the bottom of the mountain.
C) It will become lighter. The air particles in the bottle weigh less because they are from the top of the mountain.
D) It will not change because it is empty and contains no air.