An ideal non-atomic gas is taken round the cycle ABCDA n the P-V diagram where the coordinates of the points are $\mathrm{A}\left({\mathrm{P}}_1,{\mathrm{V}}_1\right);\mathrm{B}\left(2{\mathrm{P}}_1,{\mathrm{V}}_1\right);\mathrm{C}\left(2{\mathrm{P}}_1,2{\mathrm{V}}_1\right)$ and $\mathrm{D}\left({\mathrm{P}}_1,2{\mathrm{V}}_1\right)$. The work done during the cycle is

• A

  P₁V₁

• B

  2P₁V₁

• C

  1/2 P₁V₁

• D

  zero