Which type of energy transformation is taking place when natural gas is used to heat water?

A. chemical energy into thermal energy

B. thermal energy into mechanical energy

C. mechanical energy into electromagnetic energy

D. electromagnetic energy into chemical energy

The type of energy transformation is taking place when natural gas is used to heat water is chemical energy into thermal energy. For example is the internal combustion engine converts the potential chemical energy in gasoline and oxygen into thermal energy which by causing pressure and performing work on the pistons, is transformed into the mechanical energy that accelerate the vehicle.

A. chemical energy into thermal energy