Which of the following is an autoimmune disease in which the thyroid is overactive and produces excessive amounts of thyroid hormones?

The most common cause of hyperthyroidism is Graves' Disease.
Graves' Disease is the most common cause of hyperthyroidism, a condition characterized by an overactive thyroid gland. In Graves' Disease, the immune system mistakenly produces antibodies called thyroid-stimulating immunoglobulins (TSIs) that stimulate the thyroid gland to produce and release excessive amounts of thyroid hormones. This leads to symptoms such as weight loss, rapid heart rate, tremors, heat intolerance, anxiety, and other manifestations of hyperthyroidism.