To what lifestyle is radial symmetry an adaptation bilateral symmetry

A radial animal is certainly inactive or passively nomadic, meeting its environment similarly on all sides. In contrast, most bilateral symmetrical animals are vigorous and portable plunging through the environment. The opening becomes the mouth. Bilaterally symmetrical and 3 tissue layer such as Flatworms, Mollusks, Annelids, Arthropods, and Nematodes.

covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.

i believe the correct answer is d