Following graphs are obtained when different gases are subjected to change in pressure at constant temperature. Identify the option which has correctly matched gas wth the graph.
A. `1 rarr O_(2), 2 rarr H_(2), 3 rarr He`
B. `1 rarr CH_(4),2 rarr N_(2),3 rarr CO`
C. `1 rarr H_(2), 2 rarr O_(2), 3 rarr SO_(2)`
D. `1 rarr SO_(3), 2 rarr CO_(2), 3 rarr He`