**Core Concept**
Graves' disease is an autoimmune disorder characterized by the production of autoantibodies that stimulate the thyroid-stimulating hormone receptor (TSHR), leading to hyperthyroidism. This condition is a classic example of an autoimmune response where the immune system mistakenly targets and binds to a specific antigen.

**Why the Correct Answer is Right**
The immune response in Graves' disease is mediated by autoantibodies that mimic the action of thyroid-stimulating hormone (TSH) on the TSHR. This binding causes an overstimulation of the thyroid gland, resulting in increased production of thyroid hormones (T3 and T4). The autoantibodies are typically of the IgG class and are directed against the extracellular domain of the TSHR. The binding of these autoantibodies to the TSHR activates the receptor, leading to an increase in cyclic AMP (cAMP) levels within the thyroid cells, which in turn stimulates the production of thyroid hormones.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Graves' disease is not an example of a type IV hypersensitivity reaction, which involves cell-mediated immunity and is typically seen in contact dermatitis or transplant rejection.
* **Option B:** This option is incorrect because Graves' disease is not an example of an immune complex-mediated disease, which involves the formation of immune complexes that deposit in tissues and trigger an inflammatory response.
* **Option C:** This option is incorrect because Graves' disease is not an example of a type III hypersensitivity reaction, which involves the formation of immune complexes that deposit in tissues and trigger an inflammatory response.

**Clinical Pearl / High-Yield Fact**
Graves' disease is often associated with other autoimmune disorders, such as Hashimoto's thyroiditis, type 1 diabetes, and pernicious anemia, due to the shared presence of autoantibodies and a genetic predisposition to autoimmune disease.

**Correct Answer:** D. Humoral (Type II) immunologic response.