Answer:
Option (B)
Explanation:
The Appalachian mountains are one of the oldest mountain belts that have formed during the time of Ordovician, which is about 460-480 million years back. During this time, the super continent Pangaea was present, within which the Appalachians mountains were formed due to the convergent of the North American plate and the North African plate. But in due course of time, the direction of plate motion has changed. As a result of which these two plates moved in the opposite direction creating the Atlantic ocean.
Thus, the Appalachian orogeny was formed due to the collision between two continental plates namely the North American plate and the North African plate.
Hence, the correct answer is option (B).
