Observe the following simplified scheme and choose the correct option that matches the letters given in the boxes.

Question

p-Agnatha, q-Gnathostomata, r-Tetrapoda, s-Pisces

p-Agnatha, q-Gnathostomata, r-Pisces, s-Tetrapoda

p-Gnathostomata, q-Agnatha, r-Tetrapoda, s-Pisces

p-Tetrapoda, q-Pisces, r-Gnathostomata, s-Agnatha

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