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To prepare aqueous buffer solution of p...

To prepare aqueous buffer solution of pH = `2.85` that efficiently resists a changee in pH yet contains only a small amount of buffering agent , Which one of the following weak acid together with its salt would be best to use ?

A

m - chlorobenzoic acid `(pK_(a) = 3.98)`

B

p - chloro cinnamic acid `(pK_(a)= 4.41)`

C

2,5 - dihydroxy benozic acid `(pK_(a) = 2.97)`

D

Acetoacetic acid `(pK_(a) = 3.58)`

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