The correct option is B Archaeopteryx
The reptiles and the aves belong to the vertebrates. Archaeopteryx is a connecting link between reptiles and birds as it possesses characteristics of both birds and reptiles. Archaeopteryx possessed a long tail, teeth in jaws, long neck with cervical vertebrae, all are reptilian characters. Like birds, it had wings and beak. It was warm blooded. Hence, option B is correct.