What function is provided by the crankcase ventilation system on some diesel engines？A.Inc

What function is provided by the crankcase ventilation system on some diesel engines？

A.Increases the sludge forming tendency of lube oil

B.Prevents the accumulation of combustible gases

C.Improves lube oil cooling

D.Improves cold weather starting

请帮忙给出正确答案和分析，谢谢！