A buffer solution made up of \( \mathrm{BOH} \) and \( \mathrm{BCl} \) of total molarity \( 0.29...

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A buffer solution made up of \( \mathrm{BOH} \) and \( \mathrm{BCl} \) of total molarity \( 0.29 \mathrm{M} \) has \( \mathrm{pH}=9.6 \) and \( \mathrm{K}_{\mathrm{b}}=1.8 \times 10^{-5} \). Concentration of salt and base respectively is :
(A) \( 0.09 \mathrm{M} \) and \( 0.2 \mathrm{M} \)
(B) \( 0.2 \mathrm{M} \) and \( 0.09 \mathrm{M} \)
(C) \( 0.1 \mathrm{M} \) and \( 0.19 \mathrm{M} \)
(D) \( 0.19 \mathrm{M} \) and \( 0.1 \mathrm{M} \)
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