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B
Coelenterata
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C
Mollusca
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D
Echinodermata
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Solution
The correct option is ACoelenterata Corals are marine invertebrates in Phylum Coelenterata. They live in compact colonies of many identical individual polyps. The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. Corals have many applications ranging from jewelry, medicine, construction, etc.