Match the following Column-$I$ $(Half Reaction)$ to Column-$II$ $(n-factor)$.

Column-$I$	Column-$II$
$A$. $C_2O_4^{2-} \rightarrow 2CO_2$	$P$. $2$
$B$. $Cr_2O_7^{2-} + 14H^{+} \rightarrow 2Cr^{3+}$	$Q$. $6$
$C$. $2Na_2S_2O_3 \rightarrow Na_2S_4O_6$	$R$. $3$
$D$. $MnO_4^{-} \rightarrow MnO_2$	$S$. $1$

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