The Energy Efficiency of a Hybrid Car Is Tied to

The energy efficiency of a hybrid car is tied to

A) the use of hybrid gasolines.
B) the generation of electricity from rooftop solar panels and wind turbines affixed to the sides and undercarriage of the car.
C) the use of a gasoline engine at high speeds, whereas at low speeds an electric motor takes over; moreover, energy that would have otherwise escaped as heat is captured and stored while the car is coasting and braking.
D) the use of a gasoline engine at low speeds, whereas at high speeds an electric motor takes over; moreover, energy that would have otherwise escaped as heat is captured and stored while the car is coasting and braking.
E) the use of a gasoline engine at high speeds, and at low speeds, when the gas engine is at its most efficient, an electric motor takes over. Energy that would otherwise be gained while coasting and braking is lost as electricity and heat when it would otherwise be needed.