The correct answer is C. fossils of Archaeopteryx have traits of both dinosaurs and birds.
The fossils of Archaeopteryx exhibit characteristics that are typical of both non-avian dinosaurs (such as teeth, a long bony tail, and certain bone structures) and modern birds (such as feathers and a wishbone), providing key evidence for the evolutionary link between these two groups. This blend of features supports the idea that birds evolved from a group of theropod dinosaurs.