Identify the stages $A$ and $B$; and what is the correct labelling of $C$ and $D$ in the process of human embryonic development?

  • A
    $A$: Morula,$B$: Blastocyst,$C$: Follicular cells,$D$: Inner cell mass
  • B
    $A$: Morula,$B$: Blastocyst,$C$: Embryoblast,$D$: Trophoblast
  • C
    $A$: Morula,$B$: Blastocyst,$C$: Trophoblast,$D$: Inner cell mass
  • D
    $A$: Blastocyst,$B$: Morula,$C$: Trophoblast,$D$: Inner cell mass

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