Concept:The given fungus is Rhizopus; the part labelled II is the rounded, spore-bearing sac at the tip of the stalk.Explanation:In Rhizopus, the erect stalk is called the sporangiophore.Its swollen tip, labelled II, contains spores.This sac-like structure that produces and holds spores is known as the sporangium.The stalk itself is not the spore, stolon, or columella.Answer:D. sporangium
