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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Saurabh 1
correct answer would be Bituminous stage. As apart from this other stages don't have much hydrogen or carbon for the formation of methane gas. Anthracite have ratio of C/H is much greater which means no more hydrogen to form methane. While in case of peat and lignite, carbon amount is very less to liberate methane gas (or not possible for the formation of methane).