Which best describes how energy changes form in a car’s engine? 1.A single transformation occurs because the chemical energy of the fuel is changed to the mechanical energy of the car. 2.A single transformation occurs because the mechanical energy of the car originates from one spark. 3.Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy. 4.Multiple transformations occur because the chemical energy of the fuel must be replenished to keep the car running.