What is detonation and how is it prevented?

• A. Detonation is abnormal rapid combustion; prevented by proper lean engine operation, correct spark timing, and appropriate octane fuel.
• B. Detonation is normal and beneficial; prevented by rich operation.
• C. Detonation occurs only at high altitude; prevented by reducing octane.
• D. Detonation is caused by fuel quality only; prevented by using any octane.

Answer: (A)