Amorphous boron is extracted from borax by following steps: Borax \( \stackrel{(A)}{\longrightar...

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Amorphous boron is extracted from borax by following steps:
Borax \( \stackrel{(A)}{\longrightarrow} \mathrm{H}_{3} \mathrm{BO}_{3} \stackrel{\text { Heat }}{\longrightarrow} \mathrm{B}_{2} \mathrm{O}_{3} \stackrel{(B)}{\longrightarrow} \) Boron.
\( (A) \) and \( (B) \) are:
(A) \( \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{Al} \)
(B) \( \mathrm{HCl} \), carbon
(C) \( \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{Mg} \)
(D) \( \mathrm{HCl}, \mathrm{Fe} \)
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