Match the enzyme involved in the Krebs cycle given in column-$I$ with the reactions they catalyse given in column-$II$. Choose the correct option.

Column $I$	Column $II$
$i.$ Isocitrate dehydrogenase	$a.$ Citrate $\rightarrow$ Cis-aconitate
$ii.$ Fumarase	$b.$ Succinate $\rightarrow$ Fumarate
$iii.$ Aconitase	$c.$ Fumarate $\rightarrow$ Malate
$iv.$ Succinate dehydrogenase	$d.$ Isocitrate $\rightarrow$ Oxalosuccinic acid

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