The largest spiracles are

Prothoracic

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Mesothoracic

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Metathoracic

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First abdominal

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Solution

The correct option is A Mesothoracic
The thoracic spiracles lead into several horizontal tracheae, whereas each abdominal spiracle leads into atria. The stigmata 2 pairs are present in the thoracic region and 8 pairs in the abdominal region. Stigmata are present between mesothorax to the 8th abdominal segment. The largest spiracles are seen in Mesothorax.
So the correct answer is 'Mesothoracic'.

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