Which 0.10 M solution will have the largest concentration of hydroxide ion?

a) NaOH
b) NaCN (Ka of HCN = 4.9 x 10⁻¹⁰)
c) NaHCO₃ (Kb of HCO₃⁻ = 2.3 x 10⁻⁸)
d) NaClO₂ (Ka of HClO₂ = 1.7 x 10⁻⁴)