The phyla that classified as protostomates are

Platyhelminthes and cnidarians

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Echinodermatans and chordates

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Molluscans and arthropods

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Nematodes

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Poriferans

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Solution

The correct option is B Molluscans and arthropods
Protostomates are those animals in which the mouth appears before the anus during development, it is different from Deuterostomes in which Blastopore forms anus during embryonic development.
In protostomes, the cleavage is spiral and coelom is formed by the splitting of mesoderm. It includes Molluscs and Arthropods. Hence option C is correct.

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