Which simple machine is not correctly matched with an appropriate task for its use?

a lever: removing a nail from a board
an inclined plane: moving a heavy box up to the second floor of a building.
a wedge: splitting a log
a pulley: lifting a heavy box and moving it across a room

The simple machine that is not correctly matched with  its appropriate task is the inclined plane because there is no such big ramp that is as high as 1 storey building, the appropriate task would be Lifting a heavy box and moving it across a room. and for the pulley : Moving a heavy box up to the second floor of a building.

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings.