Concept:Ginger is propagated vegetatively through its underground stem, which is a rhizome.Explanation:Ginger rarely produces viable seeds for planting.Its horizontal, fleshy underground stem bears buds.Farmers cut this rhizome into pieces, each with at least one bud.Each piece can develop roots and shoots to grow into a new plant.Therefore, ginger is generally propagated using its rhizome.Answer:B. rhizome