**Core Concept**
The patient's presentation is consistent with a benign growth on the tongue, likely a type of tumor. The treatment of choice would depend on the histological type, size, and location of the growth. In this case, the growth is described as small and located on the lateral border of the tongue, suggesting a superficial origin.

**Why the Correct Answer is Right**
The most likely diagnosis in this scenario is a squamous cell carcinoma in situ or a small, superficial squamous cell carcinoma. The treatment of choice for small, superficial tumors on the tongue is surgical excision. This approach allows for the removal of the tumor with a margin of normal tissue, reducing the risk of recurrence. The lateral border of the tongue is a common site for such tumors, and surgical excision is typically the preferred treatment method.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is too broad. While radiation therapy may be an option for some types of tongue cancer, it is not the first-line treatment for small, superficial tumors.
**Option B:** This option is incorrect because it is not a standard treatment for small, superficial tumors on the tongue. Chemotherapy is typically used in conjunction with radiation therapy for more advanced cases of tongue cancer.
**Option C:** This option is incorrect because it is not the most appropriate treatment for small, superficial tumors on the tongue. While Mohs surgery is a valuable technique for removing skin cancers, it is not typically used for tumors on the tongue.

**Clinical Pearl / High-Yield Fact**
It's essential to note that small, superficial tumors on the tongue are often asymptomatic, and patients may present with a visible growth. A thorough examination and histological diagnosis are necessary to determine the appropriate treatment.

**Correct Answer: C. Surgical excision is the treatment of choice for small, superficial tumors on the tongue.**