Final answer:
Radial symmetry is found in phylum Cnidaria and Ctenophora, while Echinodermata also exhibits radial symmetry in the adult stage. Phylum Porifera (sponges) are asymmetrical and phylum Arthropoda has bilateral symmetry.
Step-by-step explanation:
Among the options provided, phylum Cnidaria and Ctenophora are known for animals that exhibit radial symmetry, while the phyla Porifera and Arthropoda do not show radial symmetry. Porifera, or sponges, are considered asymmetrical and do not have a distinct symmetry. Arthropoda, which includes insects, arachnids, and crustaceans, exhibit bilateral symmetry. Therefore, the correct answer is not explicitly listed among the options provided because neither option A) Porifera nor option B) Arthropoda has radial symmetry. Option C) Echinodermata, however, also exhibits radial symmetry, particularly in their adult form.