Match the following:

Mine gas	Principal constituent
P. Stink damp	1. CO
Q. White damp	2. H2S
R. Black damp	3. CH4
S. Fire damp	4. CO2

A. P-1, Q-2, R-3, S-4

B. P-3, Q-4, R-1, S-2

C. P-2, Q-1, R-4, S-3

D. P-2, Q-1, R-3, S-4

Answer: Option C