Correct Answer: reptiles that became extinct

Solution : The correct option is reptiles that became extinct.

Dinosaurs were a varied group of reptiles that lived during the Mesozoic Era millions of years ago. Dinosaurs became extinct at the end of the Cretaceous Period about 65 million years ago. The Cretaceous-Paleogene (K-Pg) extinction event wiped off the majority of dinosaur species as well as many other forms of life.