A load is suspended from the end of a metal wire. The load is then increased and the wire extends elastically. The table gives the length of the wire for different loads. When the load is $4.0\,\text{kN}$, what is the strain energy stored in the wire?
- A$16\,\text{J}$
- B$32\,\text{J}$
- C$1.0\,\text{kJ}$
- D$2.0\,\text{kJ}$