As a car moves, the engine converts energy. The system consists of: the car (including engine and fuel), Earth, and surface of the road. Which choice best describes how energy is transformed in the system.

1- As fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and absorbing energy from the environment. The energy absorbed allows parts of the engine to move. The energy from the surroundings is all transformed into chemical and mechanical energy.

2- As the fuel burns, chemical reactions occur within the feud, breaking up molecules, forming new molecules. And releasing energy. The energy released allows part of the engine to move. The chemical energy is all transformed into mechanical energy.

3- As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy is released as heat, and allows parts of the engine to move. The chemical energy is transformed into thermal energy.

4- As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy released allows parts of the engine to move. The chemical energy is all transformed into thermal and mechanical energy.