由金红石(TiO₂)制取单质Ti涉及到的步骤为：
TiO₂TiCl₄Ti
已知：①C(s)＋O₂(g)＝CO₂(g)         DH＝-393.5kJ·mol^-1
②2CO(g)＋O₂(g)＝2CO₂(g)           DH＝-566kJ·mol^-1
③TiO₂(s)＋2Cl₂(g)＝TiCl₄(s)＋O₂(g)    DH＝+141kJ·mol^-1
则TiO₂(s)＋2Cl₂(g)＋2C(s)＝TiCl₄(s)＋2CO(g)的DH是

A．－80kJ·mol^-^1

B．－160kJ·mol^-^1

C．160kJ·mol^-^1

D．80kJ·mol^-^1