Which display provides essential flight parameters to the pilot?

The Engine Warning Display is designed to provide critical information specifically related to the performance and condition of the aircraft's engines. This display alerts pilots to any malfunctions or anomalies in engine operation, which is vital for ensuring the safe operation of the aircraft.

Flight parameters, which include essential information such as engine performance metrics (like thrust, RPM, and temperature), are crucial for the pilot to make informed decisions regarding aircraft operations. When engine performance deviates from normal parameters, the Engine Warning Display becomes even more critical in guiding the pilot's actions and reactions.

The other options, while important, serve different functions. The Master Caution/Warning Lights indicate a range of system alerts but do not provide detailed flight parameters. The Navigation Display focuses on route and geographical information, while System Displays monitor various aircraft systems without emphasizing immediate flight parameters. Thus, the Engine Warning Display stands out as the most relevant in providing essential data directly related to flight operation and safety concerning the engines' parameters.