Which of the Following Buffers Will Have the Best Buffer

Multiple Choice

Which of the following buffers will have the best buffer capacity?

A) a solution containing 0.1 M HC₂H₃O₂ and 0.1 M NaC₂H₃O₂
B) a solution containing 0.05 M HC₂H₃O₂ and 0.15 M NaC₂H₃O₂
C) a solution containing 0.15 M HC₂H₃O₂ and 0.05 M NaC₂H₃O₂
D) They all have the same buffer capacity.