The advantage(s) of using \( \mathrm{O}_{2} \) rather than air in the steel industry is(are) (I)...

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The advantage(s) of using \( \mathrm{O}_{2} \) rather than air in the steel industry is(are)
(I) there is a faster conversion, so a given plant can produce more steel in a day
(II) larger quantities can be handled
(III) it gives a pure product, and the surface is free from nitrides
\( P \)
(a) I only
(b) II and III only
(c) II only
(d) I, II and III
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