**Core Concept**
A hernia occurring in a potential space is a type of hernia that develops in a pre-existing gap or opening within the abdominal wall. This can occur due to various factors such as surgical intervention, trauma, or congenital abnormalities. In the context of a gastrojejunostomy, a potential space may form posterior to the surgical anastomosis, increasing the risk of hernia formation.

**Why the Correct Answer is Right**
Peterson's Hernia is a type of internal hernia that occurs through a potential space posterior to a gastrojejunostomy. This type of hernia is a well-documented complication of gastric surgery, particularly after procedures such as Billroth II gastrectomy. The hernia occurs through the mesentery of the small intestine, which has been compromised during the surgical procedure. The formation of Peterson's Hernia is often related to the creation of a potential space between the gastrojejunostomy and the retroperitoneal structures.

**Why Each Wrong Option is Incorrect**
**Option A:** Bochdalek's Hernia is a congenital diaphragmatic hernia that occurs through a defect in the posterior diaphragm. This type of hernia is not related to gastrojejunostomy or the formation of a potential space posterior to it.
**Option C:** Littre's Hernia is a type of hernia that contains a Meckel's diverticulum. This type of hernia is not specifically related to the formation of a potential space posterior to a gastrojejunostomy.
**Option D:** Richter's Hernia is a type of hernia where only a portion of the intestinal wall herniates through a defect. This type of hernia is not specifically related to the formation of a potential space posterior to a gastrojejunostomy.

**Clinical Pearl / High-Yield Fact**
It is essential for surgeons to be aware of the potential complications of gastrojejunostomy, including the formation of Peterson's Hernia. Early recognition and treatment of this condition are crucial to prevent further complications and ensure patient safety.

**✓ Correct Answer: B. Peterson's Hernia**