Final answer:
The Appalachian Mountains (option C) have been significantly eroded over time, down to rolling hills and valleys, especially in the Valley and Ridge Province.
Step-by-step explanation:
The correct answer to the question is C. Appalachian Mountains. The Appalachian Mountains are a range of mountains that have experienced significant erosion over time. They were formed by multiple collisions with small island chains during the Paleozoic era, with the most notable period of mountain building during the collision with the supercontinent of Gondwana. The mountains have since been eroded down to rolling hills, with the most erosion seen in the Valley and Ridge Province. This province is composed of highly folded and faulted sedimentary rock that indicates Paleozoic age. The adjacent Blue Ridge Province also features much older igneous and metamorphic rock dating back to the Proterozoic era, which has also been subjected to significant erosion.