The correct option is A sporangia
Spores in pteridophytes are produced in sporangia that are borne on leaves. These leaves are called sporophylls.
Archegonia is the female sex organ in mosses, liverworts, ferns, and most conifers.
Antheridia is the male sex organ of algae, mosses, ferns, fungi, and other non-flowering plants.
Gametangia is a specialized organ or cell in which gametes are formed in algae, ferns, and some other plants.