Alternative power train includes

Solution (By Examveda Team)

Alternative power trains refer to propulsion systems that serve as alternatives to traditional gasoline or diesel-powered internal combustion engines (ICEs).

Internal Combustion (IC) Engines (Option A) are conventional but can also be adapted to run on alternative fuels such as biofuels, making them part of alternative powertrain discussions in certain contexts.

Hydrogen Fuel Cells (Option B) generate electricity through a chemical reaction between hydrogen and oxygen, producing only water as a by-product. They are a prominent example of clean alternative power trains.

Compressed Air (Option C) is another alternative, where vehicles are powered by engines running on compressed air stored in tanks. Though not widespread, it is a recognized alternative propulsion method.

Therefore, all the listed options represent forms of alternative power trains, making Option D the correct answer.