A rubber of volume 2000 cc is alternately subjected to tension and released. The figure shows the stress-strain curve of rubber. Each curve is a quadrant of an ellipse. The. amount of energy lost as heat per cycle per unit volume will be

• A.  \[\left( \frac{\pi }{2}-1 \right)\times 16\times {{10}^{2}}J\]         
• B. \[\left( \frac{\pi }{4}-1 \right)\times 8\times {{10}^{2}}J\]
• C.  \[\left( \frac{\pi }{4}-1 \right)\times 32\times {{10}^{2}}J\]         
• D.  \[\left( \frac{\pi }{2}-1 \right)\times 32\times {{10}^{2}}J\]