The correct option is B overproduction of thyroid hormone.
Graves' disease causes an overproduction of the thyroid hormones, a condition called hyperthyroidism. Common signs and symptoms of Graves' disease include: anxiety, irritability, tremors of the hands or fingers, heat sensitivity, and weight loss.
Underproduction of the thyroid hormones causes hypothyroidism, whose symptoms include weakness and lethargy, weight gain, swelling of the body, and cold sensitivity.
Oversecretion of growth hormone (GH) causes an abnormal growth of the body leading to gigantism and low secretion of GH results in stunted growth or dwarfism.