Please, help :(
In secxually-reproducing organisms, a sperm cell unites with an egg cell during fertilization.

Then, the fertilized egg, or zygote, undergoes _______ to form a massive ball of identical cells. Finally, the cells become specialized in structure and function through the process of _______.

A. mitosis; meiosis

B. cell division; cell differentiation

C. cell differentiation; cell division

D. meiosis; mitosis