The correct option is C CH4+H2+CO
Coal gas, gaseous mixture—mainly hydrogen (H2), methane (CH4), and carbon monoxide (CO) — formed by the destructive distillation (i.e., heating in the absence of air) of bituminous coal and used as a fuel. Sometimes steam is added to react with the hot coke, thus increasing the yield of gas. Coal tar and coke are obtained as by-products.