甲烷是一种高效清洁的新能源，0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量，则下列表示甲烷燃烧热的热化学方程式中正确的是

A．2CH4(g) + 4O2(g) ="=" 2CO2(g) + 4H2O(l)ΔH=―1780 kJ·mol^-1

B．CH4(g) + 2O2(g) ="=" CO2(g) +2H2O(l)ΔH= +890 kJ·mol^-1

C．CH4(g) + 2O2(g) ="=" CO2(g) +2H2O(l)ΔH=―890 kJ·mol^-1

D．2CH4(g) + 4O2(g) ="=" 2CO2(g) + 4H2O(l)ΔH=+ 1780kJ·mol^-1