I would say B.Implantation because it develops embryo, and it moves as the blastocyst through a the uterus and makes the contact with uterine wall and it still remains attached to it .
Hope this helped
Correct me if im wrong.
Answer: B. Implantation.
Reasoning: A. is the state when a man "Ejaculates" sperm.
C. Is when the sperm reaches the egg and gets inside.
D. Menstruation is the period state in a female when they release intoxicants.
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