When an animal cell goes through the process of mitosis, it divides into two smaller cells.

In order for the animal to continue growing, these two cells need to become as large as the original cell. How do the cells do this?

A. They undergo mitosis again to increase the number of cells in the area.

B. They combine with other cells around them to produce larger cells.

C. They absorb substances from the matter that the animal eats and drinks.

D. They expand by creating areas of empty space inside the cells.