Jawless fishes are included in

Chondricthyes

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Osteichthyes

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Cyclostomata

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Lung fishes

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Solution

The correct option is D Cyclostomata
Cyclostomata is characterized by round mouths. It is a group of chordates that comprises the living jawless fishes, examples are lampreys and hagfishes. They lack jaws which are replaced by retractable horny teeth. Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.
So, the correct answer is option C.

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