Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

Correct Answer: Option B — The heat of compression is not used as an ignition source of the fuel.

Gasoline engines rely on external spark ignition, requiring lower compression ratios to prevent premature auto-ignition or destructive detonation of the homogeneous fuel-air mixture. Conversely, marine diesels use high compression ratios solely for high heat of compression ignition.