Explanation:

- Sponges are marine animals that belong to a specific phylum of the animal kingdom.

- Option:1, Echinodermata - This phylum includes starfish, sea urchins, and sand dollars. They typically have radial symmetry and a water vascular system.

- Option:2, Porifera - This is the correct answer. Sponges belong to this phylum, characterized by having porous bodies and a simple cellular organization without true tissues or organs.

- Option:3, Aschelminthes - Known as roundworms, this phylum includes nematodes. They have a pseudocoelom, which is a fluid-filled body cavity.

- Option:4, Mollusca - This phylum includes snails, clams, and octopuses. Members typically have a soft body protected by a hard shell.