Which of the following engines will have heavier flywheel than the remaining ones?

• A. 30 kW four stroke petrol engine running at 1500 r.p.m
• B. 30 kW two stroke petrol engine running at 1500 r.p.m
• C. 30 kW two stroke diesel engine running at 750 r.p.m
• D. 30 kW four stroke diesel engine running at 750 r.p.m