Example of Ophiuroidea is

Star fish

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Brittle star

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Sea urchin

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Sand dollars

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Solution

The correct option is C Brittle star
'Brittle stars' or ophiuroids are echinoderms in the class Ophiuroidea. They crawl across the sea floor using their flexible arms for locomotion.
Star fish belongs to class Asteroidea. Sea urchin and sand dollar belongs to class Echinoidea. Hence, option B is correct.

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