Answer:
D. Finfish
Step-by-step explanation:
Finfishes are the true fishes and have fins and backbone. Finfishes include jawless fishes (Agnatha), cartilagenous fishes (Chondrichthyes) and bony fishes (osteichthyes). Crustaceans and mollusks are invertebrates and together make the group called as "shellfish". They lack backbone.