The correct option is
C Birds, reptiles and mammals
Amniotes are a clade of tetrapod vertebrates comprising the reptiles, birds, and mammals. They lay their eggs on land or retain the fertilized egg within the mother, and are distinguished from the anamniotes (fishes and amphibians), which typically lay their eggs in water. They are referred to as higher vertebrates.
So, the correct option is 'Birds, reptiles and mammals'.