HELP PLEASEEEEE!!!!!!
The Great Smoky Mountains are located in Tennessee and North Carolina. The Smokies are old, and it is beautiful. The Great Smoky Mountains contain many natural wonders, including cliffs, forests, and diverse plants and animals. They are even part of the Appalachian Trail and a UNESCO World Heritage site.


What type of pronoun error is present in the underlined portion of the passage?

case, person, number

Which revision fixes this error?

The smokies are old, it is beautiful.

The smokies are old, and beautiful.

The smokies are old, and they are beautiful.