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The correct answer is option 4, Porifera.
Sycon (Scypha), Spongilla (Fresh water sponge), and Euspongfc (Bath sponge) are all examples of organisms that belong to the phylum Porifera. Porifera is a phylum of animals that includes sponges. Sponges are simple, multicellular organisms that lack tissues and organs. They have a specialized type of cells called choanocytes that help them filter food particles from water.
Option 1, Coelenterata, is incorrect. Coelenterata refers to the phylum Cnidaria, which includes jellyfish, sea anemones, and corals.
Option 2, Platyhelminthes, is incorrect. Platyhelminthes refers to the phylum of flatworms, which are a separate group of animals.
Option 3, Ctenophora, is incorrect. Ctenophora refers to the phylum of comb jellies, which are also a separate group of animals.
Therefore, the correct answer is option 4, Porifera.