Biology · Kingdom Animalia

The Radiata is a superphylum that includes both the echinoderms and the ctenophores. The radiata, in this sense, are diploblastic, meaning they have two primary germ layers: endoderm and ectoderm. Thus, the correct option is B.

Organisms of Kingdom Animalia having three primary embryonic cell layers i.e., the ectoderm, mesoderm, and endoderm from which different tissues and organs of the animal's body differentiate out are known as triploblastic. Examples are frogs, flatworms, and humans.

The radiata is a superphylum that includes echinoderms and ctenophores. The radiata are diploblastic meaning, they have two primary germ layers i.e endoderm and ectoderm.

This option is incorrect.

"radioblast" is not a recognized term in standard human anatomy, histology, or biology.

This can't be the correct option.