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A physician wishes to prepare a buffer solution at \( \mathrm{pH}=3.58 \) that efficiently resists a change in \( \mathrm{pH} \) yet
\( \mathrm{P} \) contains only small concentrations of the buffering

W agents. Which one of the following weak acid together with its sodium salt would be best to use?
(a) \( m \)-chloro benzoic acid \( \left(\mathrm{p} K_{\mathrm{a}}=3.98\right) \)
(b) \( p \)-chlorocinnamic acid \( \left(\mathrm{p} K_{\mathrm{a}}=4.41\right) \)
(c) 2,5-dihydroxy benzoic acid \( \left(\mathrm{p} K_{\mathrm{a}}=2.97\right) \)
(d) acetoacetic acid ( \( \left.\mathrm{p} K_{\mathrm{a}}=3.58\right) \)
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