You Wish to Prepare an HC₂H₃O₂ Buffer with a PH

You wish to prepare an HC₂H₃O₂ buffer with a pH of 4.24.If the pK_a of is 4.74,what ratio of
C₂H₃O₂^-/HC₂H₃O₂ must you use?

A) 0.10
B) 0.50
C) 0.32
D) 2.0
E) 2.8