What are the purposes of engine cooling? Select the three primary purposes.

The primary purposes of engine cooling are essential for the optimal performance and longevity of the engine. Focusing on the purposes listed in the correct answer, improving engine efficiency allows for better performance because a cooler engine can operate more effectively without excessive heat that can lead to losses in power. Enhancing combustion is also crucial, as the combustion process is significantly affected by temperature; an engine that is too hot may lead to improper combustion, affecting power and efficiency. Finally, ensuring reliability is vital as overheating can lead to engine failure or damage, making effective cooling systems essential for overall engine durability and performance.

These combined purposes showcase how vital engine cooling is for maintaining a well-functioning and dependable engine, which supports the assertion that options involving these aspects fundamentally contribute to the effective operation of an engine.