For the given plot, match the most appropriate graph for respective gases: (Among `H_(2),He, CO, CH_(4))`
A. `{:(P,Q,R,S),(H_(2),He,CO,CH_(4)):}`
B. `{:(P,Q,R,S),(He,H_(2),CH_(4),CO):}`
C. `{:(P,Q,R,S),(He,H_(2),CH_(4),CO):}`
D. `{:(P,Q,R,S),(CO,He,H_(2),CH_(4)):}`