Which One of the Following Aqueous Solutions, When Mixed with an Equal

Which one of the following aqueous solutions, when mixed with an equal volume of 0.10 mol L^-1 aqueous NH₃, will produce a buffer solution?

A) 0.10 mol L^-1 HCl
B) 0.20 mol L^-1 HCl
C) 0.10 mol L^-1 CH₃COOH
D) 0.050 mol L^-1 NaOH
E) 0.20 mol L^-1 NH₄Cl