*/*_If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains?

*/*_If the flame of a miner's safety lamp in the upper layers of the s

1.	/_If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains?
A.	Hydrogen sulphide
B.	Carbon dioxide
C.	Methane
D.	Oxygen
Answer» D. Oxygen