已知：(1)Zn(s)＋1/2O₂(g) = ZnO(s)；ΔH =－348.3 kJ/mol；(2)2Ag(s)＋1/2O₂(g) = Ag₂O(s)；ΔH =－31.0 kJ/mol，则Zn(s)＋Ag₂O(s) = ZnO(s)＋2Ag(s)的ΔH等于（ ）

A．－317.3 kJ/mol

B．－379.3 kJ/mol

C．－332.8 kJ/mol

D．317.3 kJ/mol