已知①2C(s)+O₂(g)2CO(g)　ΔH="-221.0" kJ·mol^-1
②2H₂(g)+O₂(g)2H₂O(g)　ΔH="-483.6" kJ·mol^-1
则反应C(s)+H₂O(g)CO(g)+H₂(g)的ΔH为(　　)

A．+131.3 kJ·mol^-1

B．-131.3 kJ·mol^-1

C．-352.3 kJ·mol^-1

D．+262.6 kJ·mol^-1