Match the Column-$I$ with Column-$II$ and mark the appropriate choice.

Column-$I$	Column-$II$
$A. V_2O_5$	$i. \text{Conversion of } SO_2 \text{ to } SO_3$
$B. Ni$	$ii. \text{Hydrogenation of oils}$
$C. MnO_2$	$iii. \text{Preparation of } O_2 \text{ from } KClO_3$
$D. Fe$	$iv. \text{Haber's process}$

• A
  $A-i, B-ii, C-iii, D-iv$
• B
  $A-ii, B-i, C-iii, D-iv$
• C
  $A-iii, B-iv, C-ii, D-i$
• D
  $A-iv, B-ii, C-i, D-iii$