To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an （）.

A.concentrations of explosive gas
B.an oxygen deficiency in a space
C.the presence of harmful amounts of carbon monoxide
D.All of the above

A.sludge
B.oily ballast water
C.bilge slops
D.All of the above

A.fuel oil only
B.crude oil only
C.liquefied petroleum gas
D.petroleum oil of any kind