Which mountain range is primarily located in the Upper Peninsula of Michigan?

The Keweenaw Peninsula range is primarily located in the Upper Peninsula of Michigan, making it the correct choice. This mountain range is part of the larger North American midcontinent and is known for its unique geological features, including significant copper deposits that played a crucial role in the region's mining history. The range includes elevations such as Brockway Mountain, which provides stunning views of Lake Superior.

In contrast, the Allegheny and Appalachian Mountains are primarily found in the eastern United States, stretching through states like Pennsylvania and West Virginia, far from Michigan. The Rocky Mountains are located much further west, primarily through Colorado, Wyoming, and other western states, and do not extend into Michigan at all. Therefore, the unique characteristics and geographical positioning of the Keweenaw Peninsula range firmly establish it as the prominent mountainous area in Michigan's Upper Peninsula.