Answer:
The correct answer is Option A. the number of cells in an organism.
Explanation:
Cell division is process in which increases occurs in the number of cell through splitting of cells into two parts It occurs in living organisms such as plants and animals. Through this process, the body of organisms increases in size. There two types of cell division i. e. Mitosis and meiosis. Mitosis occurs in body cells while meiosis occurs in sex cells.