The correct option is A Equisetum
Strobilus or cone is a structure produced by some pteridophytes and gymnosperms. It consists of numerous densely aggregated sporophylls which subtend the sporangia. The sporangia are the structures present in sporophytes, in which the spore mother cells undergo meiosis to produce haploid spores.
Equisetum and Selaginella are pteridophytes which produce strobili. Salvinia and Pteris are pteridophytes which do not produce strobili. Marchantia is a bryophyte.