Given below are four statements each with one or two blanks. Select the option which correctly fills up the blanks in any two statements.
(A) The embryo with 8 to 16 blastomeres is called a (i) .
(B) Embedding of the (i) in the endometrium of the uterus is called implantation and it leads to (ii) .
(C) After implantation, finger like projections appear on the trophoblast called (i) , which are surrounded by the (ii) and maternal blood.
(D) Inner cell mass contains certain cell called (i) cells which have the potency to give rise to all the tissues and organs.