Turbellarians are free living:

Nematodes

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Cestodes

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Flat worms

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Trematodes

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Solution

The correct option is C Flat worms
The Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic.
Turbellaria are characterized by a soft epidermis that is ciliated, at least on the ventral surface.
Hence, correct answer is option C.

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