To find the cause of a gasoline engine's failure to start, you should

A
Break the joint in the fuel line at the engine and let the gas run in the bilges
B
Disconnect the wires at the spark plugs and make the spark jump the gap
C
Prime the engine with ether through spark plug openings
D
Ventilate the space, then check the battery, spark plugs, carburetor, and fuel line
E