Study the given flow chart and select the option which correctly identifies P, Q, R and S.
P | Q | R | S | |
A | Sulphur dioxide | Water vapour | UV rays | Oxygen |
B | Oxides of nitrogen | Oxygen | UV rays | Nitrogen |
C | Sulphur dioxide | Carbon dioxide | CFCs | Ozone |
D | Oxides of nitrogen | Methane | UV rays | Helium |
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