Match column-$I$ (scientists) with column-$II$ (discovery) and select the correct option.

Column-$I$	Column-$II$
$A$. Leeuwenhoek	$I$. First saw and described a living cell
$B$. Robert Brown	$II$. Presence of cell wall is unique to plant cells
$C$. Schleiden	$III$. Discovered the nucleus
$D$. Schwann	$IV$. All plants are composed of different kind of cells

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