Arms are absent in

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(C) Arms are absent in the class $Echinoidea$ (e.g.,sea urchins) and class $Holothuroidea$ (e.g.,sea cucumbers). In $Echinodermata$,the body plan vari

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Both $(A)$ and $(B)$

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(C) Arms are absent in the class $Echinoidea$ (e.g.,sea urchins) and class $Holothuroidea$ (e.g.,sea cucumbers). In $Echinodermata$,the body plan varies significantly. Sea urchins belong to $Echinoidea$,which are globular or disc-shaped and lack arms. Sea cucumbers belong to $Holothuroidea$,which are elongated and also lack arms.

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