Final answer:
The most famous and abundant coelurosaurs are the tyrannosaurids, which were part of the dinosaur group dominating during the Mesozoic era, with T. rex being a well-known example. Thus, the option D- tyrannosaurids is the correct answer.
Step-by-step explanation:
The best known and only truly abundant coelurosaurs are the tyrannosaurids. Discussing the broader group to which tyrannosaurids belong, during the Mesozoic era, dinosaurs dominated the landscape until the end of the Cretaceous, which marked their extinction, except for the birds, the only living descendants of theropod dinosaurs. Dinosaurs are divided into two primary groups: Ornithischia, also known as "bird-hipped" dinosaurs, and Saurischia, which includes the "lizard-hipped" dinosaurs, from which birds actually evolved. The tyrannosaurids, a family within the Coelurosauria, were bipedal predators known for their massive size and formidable carnivorous nature, and include the famous Tyrannosaurus rex.