In Echinoderms:

Reproduction is asexual only

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Fertilization is usually internal

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Sexes are united

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Development is indirect with free-swimming larve.

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Solution

The correct option is D Development is indirect with free-swimming larve.
The correct answer is option D.
In Phylum Echinodermata the reproduction is sexual and the sexes are separate, that is, they are unisexual organisms.
Fertilization is usually external fertilization and development is indirect with free swimming larva and the larva is bilaterally symmetrical.
so A,B,C options are wrong and D is the correct one .

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