Heat energy absorbed by a system in going through a cyclic process shown in the given figure is

• A

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

• B

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

• C

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

• D

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