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B
Sponges
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C
Roundworms
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D
Flatworms
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Solution
The correct option is B Sponges
Poriferans, i.e., sponges have a cellular level of body organization.
Cnidarians have tissue grade of body organization.
Roundworms have organ-system level of body organization.
Flatworms have organ and organ system level of body organization.
The cell aggregate plan is a type of body plan in which the body has clusters or aggregation of cells that are not organized into tissues or organs. It is seen in the phylum Porifera.