An Embryo Fish Is in Its Egg,without Fully Developed Tissues

An embryo fish is in its egg,without fully developed tissues and organs to survive outside the egg.The embryo has a large number of cells undergoing mitosis for the purpose of

A) production of new cells that can differentiate and specialize for different functions.
B) replication of new DNA copies, so that meiosis will further grow the embryo.
C) sexual reproduction of gametes, to produce new offspring.
D) asexual reproduction, to produce larger numbers of embryos, so that some will survive.
E) fertilization of the gametes, so the embryo can continue growing and hatch.