Equal volumes of the following pairs of solutions are mixed. Which pair will produce a buffer solution?
A. 0.10 M HCl and 0.05 M NH3
B. 0.10 M HCl and 0.05 M NaOH
C. 0.10 M HCl and 0.15 M NH3
D. 0.10 M HCl and 0.20 M NaCl
E. 0.10 M HCl and 0.20 M CH3COOH