The graph shows temperature against time for a wax sample being heated until it melts. The wax has a mass of $200\,\text{g}$. Thermal energy is delivered to the wax at a steady rate of $12000\,\text{J min}^{-1}$. What is the specific latent heat of fusion of the wax?
- A$180\,\text{J g}^{-1}$
- B$240\,\text{J g}^{-1}$
- C$480\,\text{J g}^{-1}$
- D$600\,\text{J g}^{-1}$