**Core Concept**
A direct inguinal hernia occurs through a weakness in the posterior wall of the inguinal canal, specifically through Hesselbach's triangle, which is bounded by the inguinal ligament, the lateral margin of the rectus sheath, and the inferior epigastric vessels. This type of hernia is more common in adults and often presents as a bulge in the groin area.

**Why the Correct Answer is Right**
Direct inguinal hernias typically occur in individuals over the age of 40 and are more common in men. They are associated with increased intra-abdominal pressure, which causes the weakened area in Hesselbach's triangle to bulge outward. The posterior wall of the inguinal canal is composed of the transversalis fascia and the inguinal aponeurotic falx, which provide minimal support against the increased pressure. As a result, the hernia protrudes through this weak area.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because indirect inguinal hernias occur through a separate route, specifically through the deep inguinal ring, and often present in a different demographic, such as infants and children.

**Option B:** This option is incorrect because femoral hernias occur through the femoral canal, which is a separate anatomical structure located below the inguinal ligament, and are more common in women.

**Option C:** This option is incorrect because lumbar hernias occur through a weakness in the posterior abdominal wall, specifically through the triangle of doom, and are more common in individuals with a history of lumbar surgery or trauma.

**Clinical Pearl / High-Yield Fact**
It is essential to differentiate between direct and indirect inguinal hernias, as the treatment and surgical approaches differ significantly. A thorough physical examination and imaging studies, such as ultrasound or CT scan, can help determine the type and extent of the hernia.

**Correct Answer: B. Femoral hernias occur through the femoral canal, which is a separate anatomical structure located below the inguinal ligament, and are more common in women.**