Answer:
C. The reader’s comment is not a credible source because nothing is known about the person who wrote the comment.
Explanation:
It is a false statement that the <span>Appalachians, the oldest North American mountains, are an example of upwarped mountains. The correct option among all the options that are given in the question is the second option. The Appalachians are examples of folded mountains. I hope the answer has helped you.</span>
