The correct match of the complexes with their structure and magnetic property is:

Complex	Structure and magnetic property
$i$. $NiCl_4^{2-}$	$p$. tetrahedral and diamagnetic
$ii$. $Ni(CO)_4$	$q$. tetrahedral and paramagnetic
$iii$. $PtCl_4^{2-}$	$r$. square planar and diamagnetic
$iv$. $Ni(CN)_4^{2-}$	$s$. square planar and paramagnetic

• A
  $i$ $\rightarrow q, ii$ $\rightarrow p, iii$ $\rightarrow r, iv$ $\rightarrow r$
• B
  $i$ $\rightarrow q, ii$ $\rightarrow p, iii$ $\rightarrow r, iv$ $\rightarrow r$
• C
  $i$ $\rightarrow q, ii$ $\rightarrow p, iii$ $\rightarrow r, iv$ $\rightarrow r$
• D
  $i$ $\rightarrow q, ii$ $\rightarrow p, iii$ $\rightarrow r, iv$ $\rightarrow r$