The graph presents how a metal sample responds when it is stretched until plastic deformation begins. What is the total work done in stretching the sample from zero to $12.0\,\text{mm}$ extension? Approximate the calculation by treating the curve $XY$ as a straight line.
- A$3.30\,\text{J}$
- B$3.55\,\text{J}$
- C$3.60\,\text{J}$
- D$6.60\,\text{J}$