Correct Option: A
The tetrapod vertebrae which are reptile, bird, and mammal have a clade called amniotes.
They are characterized by having the property of laying eggs with an amnio within.
Reptiles are cold-blooded or poikilotherms.
Reptiles are Reptiles that have non-glandular skin types.
It has very dry and scaly skin.
Sexes are separate.
fertilization is internal.
Hence, Reptiles are Poikilotherms and Amniotes.