Concept:Plants that grow without seeds are called cryptogams. Ferns are a classic example of such seedless plants.Explanation:Ferns reproduce through spores, not seeds. Spores are released from the underside of fern leaves.Ferns do not produce flowers or fruits. Other cryptogams include mosses, liverworts, and algae.Apple, Pinus, and Prunes all produce seeds. Hence, fern is the only seedless plant among the options.Answer:C. Fern