(B) Sea anemone (genus $Adamsia$) belongs to the phylum $Cnidaria$ (also known as $Coelenterata$).Within this phylum,it is classified under the class

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(B) Sea anemone (genus $Adamsia$) belongs to the phylum $Cnidaria$ (also known as $Coelenterata$).Within this phylum,it is classified under the class $Anthozoa$.$Anthozoa$ includes organisms that exist only in the polyp form and lack a medusa stage.Therefore,the correct option is $B$.