The correct option is
A AnthozoaSea anemones are a group of water-dwelling, predatory animals which belong to the order
Actiniaria. They are named after
Anemone which is a terrestrial flower. Sea anemones are classified in the phylum
Coelenterata, class
Anthozoa. They have large polyps that allow for digestion of larger prey and also lack a medusa stage. Many sea anemones form symbiotic relationships with single-celled dinoflagellates.
Therefore, the correct answer is option C.