Which of the following statements best describes the sequence of embryonic development before and after implantation?

• A. After fertilization, the zygote undergoes mitotic cleavage to form gastrula which attaches to the uterus and undergoes organogenesis.
• B. After fertilization, the zygotes attach to the uterus and undergo mitotic cleavage to form morula which further divides to form blastula and undergoes gastrulation.
• C. After fertilization, the zygote undergoes mitotic cleavage to form a morula and further divides to form a blastula which attaches to the uterus and undergoes gastrulation.
• D. None of the above

Answer: (C)