下列选项中的图像所表示的内容与相应反应符合的是(a、b、c、d均大于0)

A．4NH3(g)＋5O2(g) 4NO(g)＋6H2O(g)ΔH＝－a kJ·mol^－^1

B．N2(g)＋3H2(g) 2NH3(g)　ΔH＝－b kJ·mol^－^1

C．2SO3(g) 2SO2(g)＋O2(g)　ΔH＝＋c kJ·mol^－^1

D．2N2O5(g) 4NO2(g)＋O2(g) ΔH＝＋d kJ·mol^－^1