The first mammals were like $A$. Their fossils are small-sized. Mammals were $B$ and protected their unborn young inside the mother's body. Choose the correct option for $A$ and $B$ to complete the given $NCERT$ statement.

  • A
    $A-$shrews,$B-$viviparous
  • B
    $A-$monkeys,$B-$viviparous
  • C
    $A-$monkeys,$B-$oviparous
  • D
    $A-$shrews,$B-$oviparous

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