Bilateral symmetry, blastopore mouth and true coelom occur in:

Echinodermata

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Chordata

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Annelida

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Platyhelminthes

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Solution

The correct option is C Annelida
Bilateral symmetry, blastopore forming mouth and true coelom are characteristic features of phylum Annelida.
Chordates and Echinoderms are deuterostomes in which embryonic blastopore forms anus.
Phylum Platyhelminthes lack a true coelom.
Thus, the correct answer is option C.

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