已知：HCN(aq)与NaOH(aq)反应的ΔH ="-15.1" kJ·mol^-1；HCl(aq)与NaOH(aq)反应的ΔH ="-55.6" kJ·mol^-1，则HCN在水溶液中电离的ΔH等于（  ）

A．+53.7 kJ·mol^-1	B．+40.5 kJ·mol^-1
C．+43.5 kJ·mol^-1	D．+70.7kJ·mol^-1