Heat energy absorbed by a system in going through a cyclic process shown in Fig. 17.35 is:
 

• A

  ${10}^2\mathrm{\pi J}$

• B

  ${10}^3\mathrm{\pi J}$

• C

  ${10}^4\mathrm{\pi J}$

• D

  ${10}^7\mathrm{\pi J}$