One question in chem !

1.which of the following does not correctly describe the behavior of a gas?

a. at constant temperature and moles of gas, as the volume increases, the pressure decreases.

b. at constant volume and temperature, as the moles of gas increases, the pressure decreases.

c. at constant temperature and moles of gas, if the volume is halved, the pressure is doubled.

d. at constant volume and temperature, if the moles of gas are tripled, the pressure is tripled.