Ans.
Embryogenesis or embryonic development is defined as a process that involves formation and development of a zygote into embryo. The fertilized egg or zygote undergoes mitotic divisions through cleavage and divides rapidly.
The first stage of embryonic development is known as morula that represents a 16 cells consisting solid ball-like structure. The morula later develops into blastula.
Thus, the correct answer is option C). 'morula.'