The Chief and 3rd Engineers went below,changed the fuel to diesel oil and reduced the engine to slow ahead.This sentence implies all those below except that ________ .
A.
the Engine was not on slow ahead before Chief and 3rd Engineers went down
B.
the Engine was using diesel oil before Chief and 3rd Engineers went down
C.
the Engine was using fuel oil before Chief and 3rd Engineers went down
D.
the Chief and 3rd Engineers went into the Engine Room to operate the Engine