Clams, snails, sea slugs, and octopuses belong to the phylum

A) Annelida.
B) Mollusca.
C) Porifera.
D) Platyhelminthes.
E) Arthropoda.

Mollusca

A large phylum of invertebrate animals that includes snails, slugs, mussels, and octopuses, characterized by a soft body that in many species is enclosed by a hard shell.

Clams

Aquatic mollusks with a shell that is divided into two parts, known for living buried in sand or mud and being a source of food for various predators, including humans.

Octopuses

Cephalopod mollusks with eight arms, known for their intelligence, ability to change color, and escape skills.