**Core Concept**
Appendicular carcinoma is a type of colorectal cancer that arises from the appendix, a small, blind pouch attached to the large intestine. The treatment of appendicular carcinoma depends on the tumor's size, location, and stage, as well as the patient's overall health.

**Why the Correct Answer is Right**
For a 3cmx2cm appendicular carcinoma in a 24-year-old male, the recommended treatment is surgical resection, specifically a right hemicolectomy. This involves removing the appendix, a portion of the small intestine, and part of the large intestine. The goal of surgery is to remove the tumor completely and prevent recurrence. In this case, the patient's age and the tumor's size suggest a good prognosis with surgical treatment.

**Why Each Wrong Option is Incorrect**
**Option A:** Chemotherapy alone is not sufficient for treating appendicular carcinoma, as it may not be effective in eradicating the tumor completely. While chemotherapy may be used as an adjunct to surgery or in advanced cases, it is not the primary treatment for early-stage appendicular carcinoma.
**Option B:** Radiotherapy is not typically used as a primary treatment for appendicular carcinoma, especially for small tumors in early stages. However, it may be considered in cases where surgical resection is not feasible or in palliative care.
**Option C:** Observation or watchful waiting is not appropriate for a 3cmx2cm appendicular carcinoma, as this tumor size suggests a higher risk of metastasis and recurrence. Early surgical intervention is necessary to prevent complications and improve outcomes.

**Clinical Pearl / High-Yield Fact**
Appendicular carcinoma is a rare but aggressive type of colorectal cancer, and early detection is crucial for improving survival rates. A high index of suspicion and prompt surgical intervention are essential in managing this condition.

**Correct Answer:** C. Right hemicolectomy.