A:C(s)+O2(g)=CO(g)△H=-393.5 kJ/mol
B:2H2(g)+O2(g)=2H2O(g)△H=+571.6 kJ/mol
C:C2H4(g)+3O2(g)=2CO2(g)+2H2O(g)△H=-1411.0 kJ/mol
D:1/2C6H12O6(s)+3O2(g)=3CO2(g)+3H2O(l)△H=-1 400 kJ/mol