After implantation, finger-like projections on the trophoblast are called $...A....$ which are surrounded by  $...B..$ and maternal blood. Here $A$ and $B$ refers to

  • A

    $A-chorion; B-foetal\; cell$

  • B

    $A-chorionic\; villi; B- uterine\; tissue$

  • C

    $A-uterine\; tissue; B-chorionic\; villi$

  • D

    $A-foetal\; cell; B-chorion$

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