An ideal gas with $$n$$ moles is initially at pressure $$P$$ and temperature $$T$$. It is cooled isochorically to a pressure $$P/4$$. The gas is then expanded at a constant pressure so as to attain back its initial temperature $$T$$. Work done by gas during the entire process is

A

$$\frac54nRT$$

B

$$\frac34nRT$$

C

$$\frac14nRT$$

D

0