Final answer:
The three main clades of theropod dinosaurs are the ceratosaurs, carnosaurs, and coelurosaurs.
Step-by-step explanation:
The three main clades of theropod dinosaurs are the ceratosaurs, carnosaurs, and coelurosaurs. The correct answer to the question is B. ceratosaurs, carnosaurs, coelurosaurs. These groups represent the major lineages within the theropod suborder, which is part of the larger group of dinosaurs known as the Saurischia or “lizard-hipped” dinosaurs. Interestingly, it’s this group, specifically the theropods, that gave rise to birds, making them a fascinating area of study in evolutionary biology.