The correct answer is polydipsia, polyuria, weight loss, and polyphagia.
The classic signs of type I diabetes mellitus comprise polyuria, polydipsia, weight loss, and polyphagia. The recurrent infections and visual changes are the signs of diabetes. Weakness, hypotension, and mental confusion are the signs of hypoglycemia. Abdominal pain, vomiting, and sweet breath are the sign of diabetic ketoacidosis.