What engines are used in the BAe 146 aircraft?

The BAe 146 aircraft is powered by four Avco Lycoming ALF502 turbofan engines, making this choice the correct answer. The ALF502 engine is known for its efficiency and reliability, which are crucial in regional air transport operations. This engine type was specifically designed for the BAe 146 to provide the necessary thrust while maintaining low noise levels and reduced emissions, aligning with the aircraft's role in serving regional airports and flying in noise-sensitive areas.

The other options refer to different types of engines that are not compatible with the BAe 146. For example, CFM 56 turbofans are typically used in larger aircraft like the Boeing 737 and Airbus A320, while Rolls Royce Conway turbojets and Allison T56 turboprops are associated with different aircraft entirely, neither of which corresponds to the specifications or design of the BAe 146. By understanding the engine specifications, one can appreciate the BAe 146's capabilities in the regional aviation sector.