During the inspection, the starting air valves should be closed （）the engine from turning.

A.in order that
B.because of
C.in order to
D.owing to

A.should be correctly carried out
B.should correctly be taken place
C.should carried with care
D.must to carry out with great care

A.a shortened ignition delay period
B.a lean fuel/air mixture
C.excess fuel in the combustion chamber
D.rapid vaporization of injected fuel droplets