下列热化学方程式中△H代表燃烧热的是

A．CH4 ( g ) + 3/2O2 ( g ) = 2H2O ( l ) + CO ( g )△H1

B．S ( s ) + 3/2O2 ( g ) = SO3 ( s )△H2

C．C6H12O6 ( s ) + 6O2 ( g ) = 6CO2 (g) + 6H2O ( l )△H3

D．2CO ( g ) + O2 ( g ) = 2CO2 ( g )△H4