Which of the Following Buffers Will Have the Lowest PH

Multiple Choice

Which of the following buffers will have the lowest pH?

A) A solution containing 0.20 M HC₂H₃O₂ and 0.20 M NaC₂H₃O₂ will have the lowest pH.
B) A solution containing 0.25 M HC₂H₃O₂ and 0.15 M NaC₂H₃O₂ will have the lowest pH.
C) A solution containing 0.15 M HC₂H₃O₂ and 0.25 M NaC₂H₃O₂ will have the lowest pH.
D) They all will have the same pH.