Pressure changes have no effect on the entropy of substances in which of the following states? a. solids and gases c. liquids and solids b. liquids and gases d. gases only

The answer is c. liquids and solids

This situation is mainly caused by the volume changes between the two form. The volume change for both liquid form and solid form is not big enough to cause the molecules become spread out in the process (even more so for solid form), so pressures changes basically no have no effect for substances in these states.

The answer is C. pressure doesn't effect liquids and solids