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)._____ abnd maternal blood.
(D). Inner cell mass contains certain cells called (i)._____ cells which have the potency to give rise to all the tissues and organs.