Ahiker seals a plastic bag that contains dried fruit before the climbs a mountain. what will most likely happen to the plastic bag as the hiker reaches the top of the mountain a) the bag will expand b) the bag will shrink c) the bad will remain the same size d) the bag will allow air to enter

From the ideal gas equation,

where n is number of moles, R is Universal gas constant, P is pressure, V is volume,  and T is temperature of the gas.

The pressure and volume are inversely proportional to each other at constant temperature and number of moles.

Hence, on decreasing the pressure, the volume will increase.

As the hiker reaches a height of a mountain, the pressure would decrease which results in the reestablishment of equilibrium between gas molecules thus resulting in pushing of bag outwards.

Hence, the bag will expand as the hiker reaches the top of the mountain.