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B
Holothuroidea
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C
Echinoidea
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D
Ophiuroidea
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Solution
The correct option is B Holothuroidea Cucumaria is a genus of sea cucumber belonging to the class Holothuroidea under the phylum Echinodermata. These are triploblastic and they are radially symmetrical. These are coelomate and have a true body cavity.