Which mountain range sits entirely inside the boundaries of Big Bend National Park?

Which mountain range sits entirely inside the boundaries of Big Bend National Park?

A Rocky Mountains
B Chisos Mountains
C Appalachian Mountains

The iconic Chisos Mountains are one of the park’s top attractions, and the only US mountain range to be fully contained within a single national park. These mountains are home to black bears, mountain lions, javelinas, and a variety of bird species, including the rare Colima warbler.

The correct answer is Chisos Mountains.