Which of the following engines uses air compression ignition to generate power?

The engine type that uses air compression ignition to generate power is the diesel engine. In a diesel engine, air is compressed to a high pressure, which causes an increase in temperature. Once the air is heated sufficiently, the diesel fuel is injected into the combustion chamber, where it ignites due to the high temperature from the compressed air, resulting in a powerful explosion that drives the engine's pistons.

This method of ignition differs significantly from gasoline engines, which use spark plugs to ignite a mix of air and fuel. Hydrogen engines typically utilize a different combustion process or fuel cell technology, and electric engines rely solely on electric power rather than combustion. Therefore, the unique mechanism of a diesel engine that relies on air compression for ignition sets it apart from the other options provided.