The diagram shows a process that occurs during the development of an organism.

Intestinal cells.
Muscle cells. Liver cells.
Blood cells. Nerve cells.
Cardiac cells.

Which statement explains how the different cell types in the image are formed?
A
Each cell type uses its own unique replication process.
B
Each cell type expresses different genes at different times.
C
Each cell type contains a different part of the original DNA.
D
Each cell type has different enzymes to replicate genetic material.