**Core Concept**
The question is testing the management of patients with recurrent renal stones, specifically the dietary and lifestyle modifications recommended to prevent future stone formation. The underlying principle is the understanding of the pathophysiology of kidney stones, including the role of hydration, diet, and other factors.

**Why the Correct Answer is Right**
Recurrent renal stones are often caused by an imbalance of electrolytes and minerals in the urine, leading to the formation of stones. Adequate hydration is essential to prevent the concentration of these substances in the urine. The patient should be advised to drink plenty of water to maintain a high urine output and dilute the concentration of potential stone-forming substances. Additionally, a low-sodium diet may be recommended to reduce the risk of calcium stones.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option may not be entirely incorrect, as a low oxalate diet can be beneficial for patients with calcium oxalate stones. However, it is not the most comprehensive advice for all types of renal stones.
* **Option B:** A high protein diet may actually increase the risk of kidney stone formation, particularly for patients with a history of calcium oxalate stones. This is because excess protein can increase the excretion of calcium in the urine.
* **Option C:** This option is not accurate, as a high-sodium diet can increase the risk of kidney stone formation, particularly for patients with a history of calcium stones.

**Clinical Pearl / High-Yield Fact**
A high urine output is essential in preventing the formation of kidney stones. Patients with a history of recurrent renal stones should aim to drink at least 2-3 liters of water per day to maintain a high urine output and dilute potential stone-forming substances.

**Correct Answer:** C.