The one that does not involve chemical energy would be : C. Coasting downhill on a bike This one requires physical energy, To be categorized as chemical energy, the bond of chemical compounds has to be released
The example that involves chemical energy are working muscles using food and burning a candle. In both of these processes many biochemical processes are involved i.e. mobilization of energy from glucose stores etc.
Coasting downhill on a bike does not involve any chemical energy. There exists an energy change i.e. potential energy is converting to kinetic energy.
Hence, the correct option is (c) "coasting downhill on a bike".
