**Core Concept**
Allergic rhinitis is an immune-mediated disorder involving **hypersensitivity reactions**. It is characterized by an overreaction of the immune system to harmless antigens, such as pollen or dust mites. This reaction is primarily driven by **IgE antibodies**.

**Why the Correct Answer is Right**
The correct answer is related to **Type I hypersensitivity reactions**, which are immediate allergic reactions. These reactions involve the release of **histamine** and other mediators from **mast cells** and **basophils**, leading to increased vascular permeability, smooth muscle contraction, and mucous secretion. This results in the typical symptoms of allergic rhinitis, such as sneezing, nasal congestion, and itching.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because Type II hypersensitivity reactions involve **antibody-dependent cytotoxicity**.
**Option C:** Incorrect because Type III hypersensitivity reactions involve **immune complex-mediated** tissue damage.
**Option D:** Incorrect because Type IV hypersensitivity reactions are **cell-mediated** and typically occur after a delayed period.

**Clinical Pearl / High-Yield Fact**
Allergic rhinitis is a common condition that can significantly impact quality of life. It is essential to recognize the role of **IgE antibodies** and **mast cells** in the pathogenesis of allergic rhinitis, as this knowledge guides treatment strategies, such as the use of **antihistamines** and **immunotherapy**.

**Correct Answer:** D. Type I hypersensitivity reaction.