The Attempt at a Solution
The shaded area is a triangle so the area of a triangle for this particular graph is this:
0.5 (Stress)(Strain) which gives:
0.5(F/A)(e/L) so the top would give work done and the bottom would give volume but we're still left with 0.5 in front of this so the answer should be A yet the answer is B? Why has the half disappeared?