A Cylindrical Container with a Movable Piston Initially Holds 1

A cylindrical container with a movable piston initially holds 1.5 moles of gas
At a pressure of 4.0 atmospheres and a volume of 2.5 liters. If the piston is moved to create a volume of 5.0 liters while simultaneously withdrawing 0.75 moles of gas, what is the final pressure if the temperature is constant?

A) 0.50 atm
B) 1.0 atm
C) 2.0 atm
D) 4.0 atm
E) 8.0 atm