**Core Concept**
The question is testing the knowledge of nutritional management in patients with short bowel syndrome, a condition where a significant portion of the small intestine is resected, impairing nutrient absorption.

**Why the Correct Answer is Right**
The best method for supplementing nutrition in these patients is intravenous (IV) nutrition, specifically total parenteral nutrition (TPN). TPN is a complete nutritional support that bypasses the gastrointestinal tract and delivers essential nutrients directly into the bloodstream. This is crucial in patients with short bowel syndrome as they have impaired nutrient absorption due to the loss of a significant portion of the small intestine.

**Why Each Wrong Option is Incorrect**

* **Option A:** Oral nutrition supplements, such as enteral formulas, may not be sufficient to meet the nutritional needs of patients with short bowel syndrome, as they still rely on the impaired small intestine for absorption.
* **Option B:** Partial parenteral nutrition (PPN) may not provide the complete nutritional support required by these patients, as it only provides certain essential nutrients and not all the necessary calories and electrolytes.
* **Option C:** Jejunal feeding tubes may not be effective in patients with short bowel syndrome, as the remaining small intestine may be too short to accommodate the tube, leading to impaired nutrient absorption.

**Clinical Pearl / High-Yield Fact**
Remember that patients with short bowel syndrome require close monitoring of their nutritional status, and TPN should be tailored to their individual needs to prevent complications such as liver dysfunction, bone disease, and metabolic disturbances.

**Correct Answer:** C. Intravenous nutrition, specifically total parenteral nutrition (TPN), is the best method for supplementing nutrition in patients who have undergone massive resection of the small intestine.