Examine the following half-reactions and select the strongest reducing agent among the species listed: HgO(s) + H2O(l) + 2e– Hg(l) + 2OH–(aq) E°= 0.0977 V Zn(OH)2(s) + 2e– Zn(s) + 2OH–(aq) E°= –1.25 V Ag2O(s) + H2O(l) + 2e– Ag(s) + 2OH–(aq) E°= 0.342 V B(OH)3(aq) + 7H+(aq) + 8e– BH4–(aq) + 3H2O(l) E°= –0.481 V