dinosaur having elaborate facial horns and a neck frill

Ceratopsians, including Triceratops and Styracosaurus, were characterized by elaborate facial horns and a bony neck frill. These herbivorous dinosaurs used these features for defense, display, and possibly combat. The other options represent different groups: Avialans were bird-like dinosaurs, Ornithopods were duck-billed dinosaurs, and Brachiosaurids were sauropods.