Bromothymol blue is an indicator with a \( K_{a} \) value of \( 6 \times 10^{-5} \). What \( \% ...

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Bromothymol blue is an indicator with a \( K_{a} \) value of \( 6 \times 10^{-5} \). What \( \% \) of this indicator is in its basic form at a \( \mathrm{pH} \) of 5 ?
(a) 40
(b) \( 85.7 \)
(c) \( 14.3 \)
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