Answer:
C. Cnidarians
Step-by-step explanation:
Cnidarians are the diploblastic organisms with two definite tissue layers derived from two primary germ layers. These tissue layers present in cnidarians are namely epidermis and gastrodermis derived from ectoderm and endoderm respectively. These two layers of tissue are separated by an acellular gelatinous layer called mesoglea.
Examples of Cnidarians: Sea anemone, hydra, jelly fishes, etc.