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a
Free-swimming animals which exhibit metagenesis.
b
Sessile animals with cnidoblasts for prey capture and anchorage
c
Marine animals which have comb plates for locomotion
d
Aquatic animals whose body is is covered by a calcareous shell
answer is C.
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Detailed Solution
Ctenophora - Marine animals which have comb plates for locomotion. These are exclusively marine organisms.Aquatic or terrestrial forms; body is is covered by a calcareous shell - MolluscaSessile or free-swimming animals with cnidoblasts exhibiting metagenesis - Cnidaria