An echinoderm which can both creep and swim actively is

Oreaster

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Ophiothrix

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Echinus

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Cucumaria

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Solution

The correct option is B Ophiothrix
Brittle stars (Ophiothrix) use their arms for locomotion. They move fairly rapidly by wriggling their arms which are highly flexible and enable the animals to make either snake-like or rowing movements.
So, the correct answer is B.

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