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 → Umbilical cord with its veins, B → Chorionic villi, C →Antrum, D → Plug of mucus in cervix

(b) A → Umbilical cord with its vessels, B → Fimbriae, C → Oocyte, D → Plug of mucus in vagina

(c) A → Umbilical cord with its vessels, B → Placental villi, C → Yolk sac, D → Plug of mucus in cervix

(d) A → Umbilical cord with its veins, B → Placental villi, C → Trophoblast, D → Plug of mucus in vagina