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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