Which of the Following Statements Best Describes the Current Scientific

Which of the following statements best describes the current scientific view of birds?

A) A group of feathered,endothermic dinosaurs that survived the Cretaceous mass extinction.
B) A group of flying,endothermic reptiles that have lost teeth,the amniotic egg,and other heavy body features as an adaptation for flight.
C) A group of feathered,ectothermic lizards that lack teeth.
D) A group of flying mammals that is derived from monotremes,which also lay amniotic eggs.