Answer:
b. Cumberland Gap Middlesboro
Explanation:
Cumberland Gap Middlesboro located in the United States was considered as a "wind" gap and a low pass, which run through the long ridge of the Cumberland Mountains, situated around the Appalachian Mountains, closer to the junction of the three states namely, Kentucky, Virginia, and Tennessee.
The gap has a V-Shape, with the ridge rises to 600ft above the pass in the south, 900ft above the Pinnacle Overlook towers in the north, and 1,600ft above sea level in Cumberland Mountains.
Hence, the right answer is Cumberland Gap Middlesboro
