(B) The relative contribution of various greenhouse gases to global warming is as follows:$1$. Carbon dioxide $(CO_2)$: $60\%$$2$. Methane $(CH_4)$: $

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(B) The relative contribution of various greenhouse gases to global warming is as follows:$1$. Carbon dioxide $(CO_2)$: $60\%$$2$. Methane $(CH_4)$: $20\%$$3$. Chlorofluorocarbons $(CFCs)$: $14\%$$4$. Nitrous oxide $(N_2O)$: $6\%$Comparing these values with the given options,the correct pair is $CFC - 14\%$.