25℃、101 kPa下，碳、氢气、甲烷和葡萄糖的燃烧热依次是393.5 kJ/mol、285.8 kJ/mol、890.3 kJ/mol、2800 kJ/mol，则下列热化学方程式正确的是

A．C(s)+1/2O2(g)=CO(g)△H=" -393.5" kJ/mol

B．2H2(g)+O2(g)=2H2O(l)△H=" -571.6" kJ/mol

C．CH4(g)+2O2(g)=CO2(g)+2H2O(g)△H=" +890.3" kJ/mol

D．C6H12O6(s) +6O2(g)=6CO2(g)+6H2O(g)△H=" -2800" kJ/mol