**Core Concept**
Glottic carcinoma refers to a type of cancer originating from the vocal cords, specifically the glottis region. The mobility of the vocal cords is a crucial factor in determining the treatment approach for this condition. In cases where the cords are fully mobile, it indicates that the tumor is likely localized and has not invaded surrounding tissues or structures.

**Why the Correct Answer is Right**
When the vocal cords are fully mobile, it suggests that the tumor is early-stage and has not compromised the vocal cord's ability to move. In such cases, surgical excision of the tumor is usually the preferred treatment option, as it offers the best chance of cure with minimal morbidity. The goal of surgery is to remove the tumor while preserving vocal cord function.

**Why Each Wrong Option is Incorrect**
**Option A:** Radiation therapy is often considered for more advanced or inoperable cases, where surgical excision is not feasible.
**Option B:** Chemotherapy is typically used as an adjunctive treatment in combination with radiation therapy, rather than as a standalone treatment for early-stage glottic carcinoma.
**Option C:** Laser ablation may be used for smaller, superficial tumors, but it is not the preferred treatment for larger or more extensive lesions.

**Clinical Pearl / High-Yield Fact**
In cases of glottic carcinoma with fully mobile cords, the key to successful treatment is early surgical intervention to remove the tumor while preserving vocal cord function.

**Correct Answer:** C.