Though not the best, option C seems to be the right choice.
Option D, which states that methane is more effective than CO2 doesn't mean that CO2 is not effective. Global warming is caused by the entrapment of the heat. Whether CO2 or methane, both will affect the same way by not allowing the heat to escape. It would not be wise to assume that replacing methane by CO2 will cause heat to escape.
Option D, which states that methane is more effective than CO2 doesn't mean that CO2 is not effective. Global warming is caused by the entrapment of the heat. Whether CO2 or methane, both will affect the same way by not allowing the heat to escape. It would not be wise to assume that replacing methane by CO2 will cause heat to escape.
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