39. The ignition delay associated with fuels of low ignition quality results in a late and moreexplosive start to the combustion period, which results in higher peak pressures and consequentrough and noisy operation. This means what？
(A) the ignition delay could increase the mean effective pressure of cycle
(B) the more explosive start to the combustion period due to ignition delay could generate thehigher peak pressure
(C) the ignition delay associated with fuels of low ignition quality is beneficial for engineperformance as it results in higher peak pressures
(D) the ignition delay associated with fuels of low ignition quality could alleviate the noisegeneration