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\[
\text { (A) } \stackrel{\mathrm{KOH}, \mathrm{O}_{2}}{\longrightarrow} \underset{\text { (Green })}{2(\mathrm{~B})}+2 \mathrm{H}_{2} \mathrm{O}
\]
\[
3(B) \stackrel{4 \mathrm{HCl}}{\longrightarrow} \underset{\text { (Purple) }}{2(\mathrm{C})}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}
\]
\[
2\left(\text { C) } \stackrel{\mathrm{H}_{2} \mathrm{O}, \mathrm{Kl}}{\longrightarrow} 2(\mathrm{~A})+2 \mathrm{KOH}+(\mathrm{D})\right.
\]
In the above sequence of reactions, (A) and (D), respectively are:
(a) \( \mathrm{KI} \) and \( \mathrm{KMnO}_{4} \)
(b) \( \mathrm{MnO}_{2} \) and \( \mathrm{KIO}_{3} \)
(c) \( \mathrm{KIO}_{3} \) and \( \mathrm{MnO}_{2} \)
(d) \( \mathrm{KI} \) and \( \mathrm{K}_{2} \mathrm{MnO}_{4} \)
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