Concept:Ginger is a rhizome, which is an underground stem modification used for storage and vegetative propagation.Explanation:The part of ginger that we use is actually a modified stem, not a root. It grows horizontally underground. This stem has distinct nodes and internodes. At the nodes, there are buds (commonly called "eyes") that can sprout into new shoots and leaves. Roots do not have nodes or buds. Leaves and fruits are not involved in this structure. Because of these features – nodes, internodes, and buds – ginger is classified as a stem modification, specifically a rhizome. Other examples include potato and turmeric.Answer:C. stem