Column-$I$	Column-$II$
$A$. Metal which occurs in the native state in nature is	$P$. $Hg$
$B$. The oxide of metal that can be commercially reduced by Aluminothermic reduction process is	$Q$. $Ti$
$C$. van Arkel method is used for preparing ultrapure metal of	$R$. $Cr$
$D$. Auto reduction process is employed for the sulphide ore of	$S$. $Ag$

• A
  $A-S, B-R, C-Q, D-P$
• B
  $A-R, B-S, C-Q, D-P$
• C
  $A-P, B-S, C-Q, D-R$
• D
  $A-Q, B-R, C-S, D-P$