How Do Chromosomes Become Visible Under a Light Microscope as a Cell

Multiple Choice

How do chromosomes become visible under a light microscope as a cell prepares to divide?

A) The cell becomes flat and thin, and its internal structures become easier to see.
B) Thin strands of chromatin coil tightly and then coil again.
C) DNA is thicker after it has replicated.
D) Chromosomes become more intensely colored before cell division.
E) Chromosomes are created before cell division, and then broken down afterward.