Match the catalyst with the process:

Catalyst	Process
$i. Na_{2}O$	$a. \text{Oxidation of } SO_{2} \text{ in the manufacture of } H_{2}SO_{4}$
$ii. TiCl_{4} + Al(CH_{3})_{3}$	$b. \text{Polymerisation of ethylene}$
$iii. PdCl_{2}$	$c. \text{The oxidation of ethyne to ethanal}$
$iv. \text{Nickel complexes}$	$d. \text{Polymerisation of alkynes}$

Which of the following is the correct option?

• A
  $i-c, ii-d, iii-a, iv-b$
• B
  $i-a, ii-b, iii-c, iv-d$
• C
  $i-a, ii-c, iii-b, iv-d$
• D
  $i-c, ii-a, iii-d, iv-b$