The right option is; D. Chrytridiomycota
The organism most likely belong to the group; Chrytridiomycota
Chytridiomycota is a phylum of fungi that have flagellated zoospores (motile cells). An important defining trait of the group is the chitin strengthening their cell walls. They are microscopic in size, and are mainly aquatic. They can be found in freshwater, marine or wet soils.