下列反应中符合上述图象的是( )
A:2SO3(g)⇌2SO2(g)+O2(g)△H>0
B:N2(g)+3H2(g)⇌2NH3(g)△H<0
C:4NH3(g)+5O2(g)⇌4NO(g)+6H2O(g)△H<0
D:H2(g)+CO(g)⇌C(s)+H2O(g)△H>0