题目选项分析

A group of paleontologists recently announced that a site in Utah has yielded fossils of some of the biggest armored dinosaurs ever found, fossils at least 25 million years older than similar dinosaur types that were previously found in North America.

A group of paleontologists recently announced that a site in Utah has yielded fossils of some of the biggest armored dinosaurs ever found, fossils that are at least 25 million years older than those of any similar dinosaur type previously found in North America.