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The given figure shows the human foetus within the uterus with few structures marked as $A,\,B,\,C$ and $D$.Which of the following options shows the correct labeling ?

• A
  $A\to $ Umbilical cord with its veins, $B\to $ Chorionic villi, $C\to $ Antrum, $D\to $ Plug of mucus in cervix
• B
  $A\to $ Umbilical cord with its vessels, $B\to $ Fimbriae, $C\to $ Oocyte, $D\to $ Plug of mucus in vagina
• ✓
  $A\to $ Umbilical cord with its vessels, $B\to $ Placental villi, $C\to $ Yolk sac, $D\to $ Plug of mucus in cervix
• D
  $A\to $ Umbilical cord with its veins, $B\to $ Placental villi, $C\to $ Trophoblast, $D\to $ Plug of mucus in vagina