Which of the following statements best reflects a plausible reason why red blood cells lose their nucleus during maturation?

A. The nucleus of a cell is no longer needed after it has replicated and matured so all cells either deactivate it or expel it.
B. The cell has other methods for producing the materials it needs to survive and reproduce.
C. The lack of organelles increases the cell's ability to carry more hemoglobin and thus more oxygen.
D. The cell relies on its mitochondrial DNA and therefore no longer needs the nucleus.