**Core Concept**
Carcinoma of the tongue, particularly those less than 2 cm in size, are considered early-stage cancers with favorable prognosis. The management of these small tumors primarily involves surgical excision to achieve local control and minimize the risk of recurrence.

**Why the Correct Answer is Right**
The standard treatment for early-stage carcinoma of the tongue is surgical excision, often in the form of a transoral laser microsurgery (TLM) or partial glossectomy. The goal of surgery is to remove the tumor with a margin of healthy tissue, thereby reducing the risk of local recurrence. In addition, surgical excision can also provide tissue for histopathological examination, which is essential for determining the tumor's histological grade and staging.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because chemotherapy and radiotherapy are not the primary treatments for early-stage carcinoma of the tongue. While these modalities may be used in conjunction with surgery for more advanced tumors or in cases of recurrence, they are not the first line of treatment for small tumors.
**Option B:** This option is incorrect because palliative care is focused on alleviating symptoms and improving quality of life in patients with advanced, incurable disease. Early-stage carcinoma of the tongue is generally considered curable with appropriate treatment, making palliative care an inappropriate choice.
**Option C:** This option is incorrect because observation or "watchful waiting" is not a recommended approach for managing early-stage carcinoma of the tongue. Even small tumors can grow and metastasize if left untreated, making surgical excision the preferred treatment option.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the management of oral cavity cancers, including carcinoma of the tongue, has evolved with advances in surgical techniques and adjuvant therapies. Early-stage tumors can be effectively treated with minimally invasive surgical approaches, reducing the risk of complications and improving patient outcomes.

**Correct Answer:** A. Surgical excision.