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B
Mollusca
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C
Crustacea
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D
Echinodermata
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Solution
The correct option is C Crustacea C. Crustacea
Reason: Nauplius larva is the first free-swimming, planktonic larvae of most marine and some freshwater crustaceans. Crustaceans belong to the phylum Arthropoda. It has no evident segmentation. There is a single median, Naupliar eye at the front of the head. There are only three pairs of appendages, the first and second antennae and the mandibles. So the correct option is C.