The Pressure of an Ideal Gas Is Directly Proportional to Which

The pressure of an ideal gas is directly proportional to which of the following three parameters?
I. Volume of an ideal gas at constant mole amount and temperature
II. Mole amount of an ideal gas at constant volume and temperature
III. Temperature of an ideal gas at constant volume and mole amount

A) II only
B) I and II
C) I and III
D) II and III
E) All of these