Please choose the correct answer to the question: When gasoline in a car engine is burned, only about 15 percent of the gasoline is converted into mechanical energy. This is because most of the energy in the gasoline is

Answer1: transformed into heat. Answer2: stored for use at a later time. Answer3: changed into chemical energy. Answer4: used to make the vehicle move.

Answer format: answer1/answer2/answer3/answer4