Answer: The correct answer is- .b.Archaeopteryx fossils share traits with both birds and reptiles.
Archaeopteryx was a primitive bird that had feathers, but its skeleton looks like a small dinosaur ( which belonged to reptiles). It had a bony tail, teeth, and claws on its wings, resembling a reptile, which have made scientists claim that Archaeopteryx fossils share traits with both birds as well as reptiles.
Due to this, it is considered as a missing link between reptiles and birds.
Thus, option B) is the right answer.