The correct answer is - B. Appalachians.
Taurus, Atlas, and Elbruz are all mountains created by the collision of the African and Arabian tectonic plates with the Eurasian tectonic plate. The African and Arabian plates are pushing towards the bigger Eurasian plate and they lift the surround area up and thus creating mountain ranges close to the border lines. Unlike these three mountains, the Appalachians are nowhere near this region and are in no way affected by the collision of the mentioned tectonic plates, the Appalachians are located in the Eastern part of the United States of America.