The correct option is D Lemna
During
hydrarch succession which occurs in aquatic habitat, the successional series
progress from hydric to mesic conditions. Submerged hydrophytes are the transitional
community in this succession. It undergoes sequential changes to reach at
climax. Submerged hydrophytes are the plants which have their roots anchored in
the mud at the bottom of the water body. Examples of submerged hydrophytes:
Myriophyllum, Hydrilla, Vallisneria, Ceratophyllum, Utricularia, etc.