A. Nymphaea, Poamogeton, Victoria
B. Utricularia, Typha, Aponogeton
C. Lemna, Spirodela, Azolla
D. Ranunculus, Vallisneria, Hydrilla
The correct answer to the question: "In which of the following groups, all the plants belong to the same category?" is "Lemna, Spirodela, Azolla ".