If the pressure acting on a given sample of an ideal gas at constant temperature is tripled, what happens to the volume of the gas?

a) The volume is reduced to one-third of its original value.
b) The volume is reduced to one-ninth of its original value.
c) The volume remains constant.
d) The volume is increased by a factor of three times its original value.
e) The volume is increased by a factor of nine times its original value.