Answer: Option B, C, and D.
Step-by-step explanation:
Phylum cnidaria are group of animals in the animal kingdom that live in aquatic habitat mostly living in marine. They have specialized cells called cnidocytes of nematocysts organelles that help in stinging and capturing prey. Their bodies is consist of mesoglea found between to epithelium layers. They are radially symmetrical .
They have two majory body forms, swimming Medusa and sessile polyps. Cnidarians are diploblastic animals. Cnidaria can reproduce sexually.