62. Fossil evidence indicates that several kinds of flightless dinosaurs possessed feathers. If some of these feather-bearingdinosaurs incubated clutches of eggs in carefully constructed nests, this might be evidence supporting the claim that
(A) the earliest reptiles could fly, and the feathers of flightless dinosaurs were vestigial flight surfaces.
(B) all fossils with feathers are actually some kind of bird.
(C) the feathers were plucked from the bodies of other adults to provide nest-building materials.
(D) their feathers originally served as insulation, and only later became flight surfaces.
(E) dinosaurs were as fully endothermal (warm-blooded) as modern birds and mammals.