(B) "Sea pen" (Pennatula) and "sea fan" (Gorgonia) belong to the class $Anthozoa$ of the phylum $Cnidaria$ (also known as $Coelenterata$).These organi

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(B) "Sea pen" (Pennatula) and "sea fan" (Gorgonia) belong to the class $Anthozoa$ of the phylum $Cnidaria$ (also known as $Coelenterata$).These organisms are exclusively marine and exhibit a polyp form, which is the dominant stage in their life cycle.Therefore, the correct option is $B$.