As far as development of all chordates. They are

Deuterostomia

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Protostomia

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Tunicates

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None of the above

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Solution

The correct option is A Deuterostomia
Deuterostomes are a group of animals including those of the phyla Echinodermata, Chordata, Chaetognatha and Brachiopoda, who are classified together on the basis of embryological development and molecular criteria. In deuterostomes, during development, the first opening (the blastopore) becomes the anus, while in protostomes, it becomes the mouth.
So, the correct answer is option A.

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