**Core Concept**
Small bowel anastomosis is a surgical procedure that involves reconnecting two severed segments of the small intestine. This procedure requires meticulous technique and understanding of the small bowel's unique anatomy and physiology.

**Why the Correct Answer is Right**
The correct answer is **C. G.I. anastomosis using a stapler**. This method is widely used in small bowel surgery due to its rapidity and low complication rate. The stapler fires metal staples that cut and approximate the bowel edges, creating a secure and watertight anastomosis. This technique is particularly useful in emergency situations where time is of the essence. The staples also reduce the risk of leaks and other complications associated with hand-sewn anastomoses.

**Why Each Wrong Option is Incorrect**
**Option A:** **A. Hand-sewn anastomosis using a continuous suture**. While hand-sewn anastomosis is a reliable method, it is generally more time-consuming and may be associated with a higher risk of leaks, particularly in emergency situations.

**Option B:** **B. End-to-end anastomosis using a ligation technique**. Ligation techniques are often used in vascular surgery, but they are not suitable for small bowel anastomosis due to the high risk of leaks and other complications.

**Option D:** **D. Side-to-side anastomosis using a Roux-en-Y technique**. While side-to-side anastomosis is sometimes used in small bowel surgery, the Roux-en-Y technique is typically reserved for specific situations, such as bypassing a portion of the small intestine.

**Clinical Pearl / High-Yield Fact**
When performing small bowel anastomosis, it's essential to ensure that the bowel edges are aligned properly and that the anastomosis is performed in a tension-free manner to minimize the risk of leaks and other complications.

**Correct Answer: C. G.I. anastomosis using a stapler.**