Given below is the representation of the extent of global diversity of vertebrates. What groups do the portions represent?

• A

  $A$. Birds

  $B$. Reptiles

  $C$. Fishes

  $D$. Mammals

  $E$. Amphibians

• B

  $A$. Mammals

  $B$. Birds

  $C$. Fishes

  $D$. Amphibians

  $E$. Reptiles

• C

  $A$. Fishes

  $B$. Amphibians

  $C$. Mammals

  $D$. Birds

  $E$. Reptiles

• D

  $A$. Fishes

  $B$. Mammals

  $C$. Birds

  $D$. Reptiles

  $E$. Amphibians