**Core Concept**
The management of lymph nodes in the lower neck for a patient with carcinoma of the tongue involves a multidisciplinary approach, including surgery, radiation therapy, and chemotherapy. The primary goal is to eradicate the cancer cells and prevent recurrence.

**Why the Correct Answer is Right**
The correct answer involves a combination of surgical and radiation modalities to address the lymph node metastasis. This approach is based on the principle of delivering a high dose of radiation to the involved lymph nodes, while minimizing the dose to surrounding structures. The treatment of choice is **radiation therapy**, specifically intensity-modulated radiation therapy (IMRT), to target the involved lymph nodes in the lower neck. This modality allows for precise delivery of radiation, reducing the risk of complications and improving local control of the disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Surgery alone may not be sufficient to address the lymph node metastasis in the lower neck, as it may not provide adequate coverage of the involved nodes.
**Option B:** Chemotherapy is an adjunctive treatment in the management of head and neck cancer but is not the primary treatment for lymph node metastasis in the lower neck.
**Option C:** A combination of surgery and chemotherapy may be considered in certain cases, but it is not the first-line treatment for lymph node metastasis in the lower neck.

**Clinical Pearl / High-Yield Fact**
When managing lymph node metastasis in the lower neck for a patient with carcinoma of the tongue, it is essential to consider the principles of radiation oncology, including the use of IMRT to deliver precise doses of radiation to the involved lymph nodes, while minimizing the dose to surrounding structures.

**Correct Answer:** C.