Concept:The upfolded portion of a fold mountain is known as the anticline.Explanation:Folding happens when horizontal rock layers are squeezed by powerful tectonic forces.This compression bends the layers into wave-like shapes.The upward arch or crest of the fold is called the anticline.The downward trough or valley between two anticlines is called the syncline.Therefore, the upfolded or raised part of a fold mountain is the anticline.Answer:B. Anticline