Does the Pressure of a Gas Decrease More Rapidly or Less

Multiple Choice

Does the pressure of a gas decrease more rapidly or less rapidly when expanding adiabatically than it would when expanding isothermally?

A) More rapidly.
B) Less rapidly.
C) The pressure decreases at the same rate in both cases.
D) The pressure increases in an adiabatic expansion.
E) The pressure increases in an isothermal expansion.