**Core Concept**
Squamous cell carcinoma (SCC) of the tongue is a type of malignant tumor that arises from the epithelial cells lining the tongue. The pathology of SCC involves uncontrolled cell growth and invasion, often resulting from chronic irritation or human papillomavirus (HPV) infection.

**Why the Correct Answer is Right**
The lateral borders of the tongue are the most common site for SCC due to their exposed location, making them more susceptible to chronic irritation from food, tobacco, and alcohol. This chronic irritation can lead to genetic mutations and epigenetic changes in the epithelial cells, ultimately resulting in cancer. The lateral borders are rich in minor salivary glands, which can also contribute to the development of SCC.

**Why Each Wrong Option is Incorrect**
**Option A:** The apex (tip) of the tongue is less commonly affected by SCC due to its relatively lower exposure to irritants.
**Option B:** The base of the tongue is a common site for other types of cancers, such as lymphoma and melanoma, but SCC is less common here.
**Option D:** The dorsum (top surface) of the tongue is also less commonly affected by SCC, as it is less exposed to chronic irritation.

**Clinical Pearl / High-Yield Fact**
When evaluating a patient with a tongue mass, it is essential to consider the patient's history of tobacco, alcohol, and HPV exposure, as these factors can increase the risk of SCC.

**✓ Correct Answer: C. Lateral borders**