Which Is a TRUE Statement About Implantation of a Blastocyst

Multiple Choice

Which is a TRUE statement about implantation of a blastocyst?

A) When it occurs outside the uterus,it is called a myopic pregnancy.
B) It normally occurs midway through the luteal phase.
C) It is a result of digestion of myometrial cells by enzymes in the trophoblast.
D) It occurs at a time in the cycle when plasma estrogen concentration is higher than progesterone concentration.
E) It occurs at the same time as,and is caused by,the LH surge.