Correct Option: C

Prior of the implantation of the blastocyst the uterus of the recipi-ent mother should be made ready to receive the embryo. This is usually done with the hormonal treatment. The blastocyst is introduced into the uterus by one of the two methods - by using a catheter through the vagina and cervical canal to the womb or directly into the uterus through a cut made in the wall of the uterus. The womb of the mother under the influence of the hormones develops the endometrium and the blastocyst gets im-planted and the normal process of pregnancy continues.