If you increase the clearance between a valve stem and rocker arm, which of the listed con

If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur？

A.valve will open later

B.valves will close later

C.amount of fuel injected will be increased

D.amount of fuel injected will be decreased

请帮忙给出正确答案和分析，谢谢！