Please help confused

Dear student,
Please find below the answer:

The correct option is (D).
Argentaffin cells are round or partly flattened cells that are found in the lining tissue of the digestive tract. They contain granules that secrete gastrin, motilin, serotonin, somatostatin, histamine, and 5-hydroxytryptamine. These cells are common throughout the digestive tract but are most concentrated in the small intestine and appendix.

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