The main culprit of greenhouse effect is Carbon dioxide. But which is the second element contributing most to greenhouse effect...? Mcqs

The main culprit of greenhouse effect is Carbon dioxide. But which is the second element contributing most to greenhouse effect...?

(A) Nitrogen Dioxide (NO2)

(B) Chlorofluorocarbons (CFCs)

(C) Methane (CH4)

(D) High-fructose corn syrup (HFCs)