Which of the Following Aqueous Solutions Will Have the Highest $\times$

Multiple Choice

Which of the following aqueous solutions will have the highest pH? For NH₃,K_b = 1.8 $\times$ 10^-5;for C₂H₃O₂^-,K_b = 5.6 $\times$ 10^-10.

A) 2.0 M NaOH
B) 2.0 M NH₃
C) 2.0 M HC₂H₃O₂
D) 2.0 M HCl
E) all the same