The body organization of cnidarians is at?

• The body organization of cnidarians is a tissue level organization. 
• It is diploblastic and has two germ layers ectoderm and endoderm. 
• Ectoderm act as outer covering of the organism and endoderm lines the inner gut. 
• In cnidaria some similar cells are associated into groups or aggregations called tissues, but true organs do not occur.

Hence, option B is the correct answer.