Which of these hiking trails is the longest at 6,875 miles?

A Oregon Trail
B Great Western Loop
C Appalachian Trail

New hikers beware: This path perambulates through rugged territory across nine Western states, two deserts, 12 national parks, and 75 wilderness areas. When you finish, take a victory lap on the American Discovery Trail, a mere additional 6,800 miles.

The correct answer is Great Western Loop.