The correct option is D All of the above
Antherozoids of fern are sperical, coiled and multiflagellate. An antheridium or antherida is a haploid structure or organ producing and containing male gametes, called as antherozoids. It is present in the gametophyte phase of ferns. Antherozoids are motile male gametes or mature sexual reproductive cells, having a single set of unpaired chromosomes.