Which compares the thermal energy found in a piece of coal with the thermal energy found in a newly opened coal mine?

The thermal energy found in a piece of coal is lesser than in the thermal energy in a newly opened coal mine. The newly opened coal mine requires a greater thermal energy to really open it due to its solid structure. Whereas in a piece of coal, it only requires a lesser amount of thermal energy to extract it.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this