Which of the following clades contains the greatest number of animal species?

Question

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Bilaterians are a diverse clade of animals that include all animals with bilateral symmetry. This includes the majority of animal species, such as arthropods, mollusks, and vertebrates. While the vertebrates are a large and diverse group, they are just one subgroup within the bilaterians. Insects are a large and diverse group as well, but they are just one subgroup within the arthropods, which are part of the bilaterians. Deuterostomes include fewer species, such as echinoderms and chordates, which includes vertebrates.

Which of the Following Clades Contains the Greatest Number of Animal