Match the terms in Column-$I$ with their explanation in Column-$II$:

Column-$I$	Column-$II$
$A$. Polycythemia	$I$. Decrease in number of WBCs
$B$. Erythrocytopenia	$II$. Increase in number of RBCs
$C$. Leukemia	$III$. Decrease in number of RBCs
$D$. Leucopenia	$IV$. Uncontrolled increase in number of WBCs

• A
  $A-II, B-III, C-IV, D-I$
• B
  $A-I, B-II, C-III, D-IV$
• C
  $A-IV, B-II, C-I, D-III$
• D
  $A-III, B-IV, C-II, D-I$