Choose the correct pair.

Column-$I$	Column-$II$
$1$. Leptotene	$p$. Homologous chromosomes are separated
$2$. Diakinesis	$q$. Nucleolus reappears
$3$. Pachytene	$r$. Chromosomes can be observed in a microscope
$4$. Anaphase-$I$	$s$. Nucleolus disappears
	$t$. Crossing over

• A
  $(1-r), (2-s), (3-t), (4-p)$
• B
  $(1-t), (2-q), (3-r), (4-s)$
• C
  $(1-p), (2-r), (3-r), (4-s)$
• D
  $(1-q), (2-r), (3-s), (4-t)$