A client has flushed skin, bulging eyes and perspiration, and states that he has been "irritable" and having palpitations. The nurse interprets these findings as suggesting:

A. Hypoparathyroidism: Hypoparathyroidism presents with low calcium levels and symptoms like muscle cramps, tetany, or numbness around the mouth and in the extremities. It is not associated with flushed skin, bulging eyes, or irritability. B. Cushing's Disease: Cushing's disease is caused by excessive levels of cortisol. Symptoms include weight gain, moon face, buffalo hump, and hypertension. The findings described, such as flushed skin, bulging eyes, and irritability, are not characteristic of Cushing's disease. C. Hypothyroidism: Hypothyroidism is associated with symptoms such as fatigue, weight gain, cold intolerance, dry skin, and constipation, not flushed skin, bulging eyes, or irritability. The symptoms described are not typical of an underactive thyroid. D. Hyperthyroidism: Hyperthyroidism (often associated with Graves' disease) presents with flushed skin, irritability, palpitations, bulging eyes (exophthalmos), and perspiration due to the overproduction of thyroid hormones.