powertrain is the system in a vehicle that generates and delivers it to the wheels, allowing the vehicle move. It typically includes the engine, transmission, drivetrain (including axles, differentials, and drive and buses have powertrains. the three types of vehicles are alternative vehicles because they use non-conventional systems compared to traditional internal engines (ICE). Full battery electric vehicles (BEVs): These are entirely by electricity stored in batteries and non-ICE systems. Hence option I is correct. Hydrogen fuel cell vehicles (FCEVs): Use hydrogen cells to generate electricity to power electric Hence it has an alternative powertrain. Hence II is correct. Fuel cell-electric hybrid vehicles: Combine a fuel cell a battery or other electric storage system. Thus it is alternative powertrain. Hence option III is correct.