One Mole of an Ideal Gas at 300 K Expands

One mole of an ideal gas at 300 K expands from 2.0 L to 9.0 L against a constant external pressure of 1.8 atm. The work done by this expansion is (in L × atm) :

A) 0
B)
C) - (300) (4.5) (1.8)
D) - (1.8) (9.0 - 2.0)
E)