已知:HCN(aq)与NaOH(aq)反应生成1 mol水的ΔH="-12.1" kJ·mol^-1;HCl(aq)与NaOH(aq)反应生成1 mol水的ΔH="-57.3" kJ·mol^-1。则HCN在水溶液中电离的ΔH等于(　　)

A．-69.4 kJ·mol^-1	B．-45.2 kJ·mol^-1
C．+45.2 kJ·mol^-1	D．+69.4 kJ·mol^-1