Some dinosaurs had feathers although they could not fly and birds have feathers that help them to fly. In the context of evolution, this means that :
(a) reptiles have evolved from birds
(b) there is no evolutionary connection between reptiles and birds
(c) feathers are homologous structures in both the organisms
(d) birds have evolved from reptiles
(d) birds have evolved from reptiles
In the context of evolution, it means that birds have evolved from reptiles.