(B) The figure shows a blastocyst,which is an early developmental stage of an embryo.It consists of an outer layer of cells called the trophoblast and

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(B) The figure shows a blastocyst,which is an early developmental stage of an embryo.It consists of an outer layer of cells called the trophoblast and an inner cell mass.The presence of a fluid-filled cavity known as the blastocoel is a characteristic feature of the blastocyst stage.Therefore,the correct option is $B$.