Match the following columns:

Column-$I$	Column-$II$
$P$. $Mg^{2+}$	$I$. Rubisco and $PEPcase$
$Q$. $Zn^{2+}$	$II$. Alcohol dehydrogenase
$R$. $Mo$	$III$. Nitrogenase

• A
  $(P-I), (Q-II), (R-III)$
• B
  $(P-I), (Q-III), (R-II)$
• C
  $(P-II), (Q-III), (R-I)$
• D
  $(P-III), (Q-II), (R-I)$