Implantation of the Blastocyst into the Endometrium Results from

Implantation of the blastocyst into the endometrium results from

A) trophoblast secretion of endocrine hormones that initiates the decidual response.
B) trophoblast secretion of enzymes and paracrines that initiates the decidual response.
C) trophoblast secretion of paracrines that initiates cell cleavage.
D) blastocoele secretion of paracrines that initiates cell cleavage.
E) blastocoele secretion of paracrines that initiates the decidual response.