Reducing the clearance between a valve stem and rocker arm will result in the valve （）

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

A.a leaking fuel injection nozzle
B.a clogged air filter
C.early fuel injection
D.burned valves

A.on the power stroke
B.on the exhaust stroke
C.at the end of the power stroke
D.at the start of the intake stroke