**Core Concept**
The diagnosis of a strangulated femoral hernia requires an understanding of the anatomy of the femoral canal and the clinical presentation of hernia strangulation. A femoral hernia occurs when tissue protrudes through the femoral canal, a narrow passageway in the thigh that allows the femoral vessels to pass through.

**Why the Correct Answer is Right**
A strangulated femoral hernia occurs when the hernia becomes constricted, cutting off blood supply to the trapped tissue. This can lead to ischemia, necrosis, and potentially life-threatening complications. The patient's symptoms of a tender swelling in the right femoral region, multiple bowel movements without relief of symptoms, and a history of femoral hernia are consistent with strangulation of the hernia. The location of the swelling immediately below and lateral to the pubic tubercle is also consistent with a femoral hernia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the clinical presentation of a strangulated femoral hernia.
**Option B:** This option is incorrect because the patient's symptoms and history are not consistent with a strangulated inguinal hernia.
**Option C:** This option is incorrect because the patient's symptoms and history are not consistent with a femoral vein thrombosis.

**Clinical Pearl / High-Yield Fact**
A femoral hernia is more common in women than men, particularly in postmenopausal women, due to the wider pelvis and increased intra-abdominal pressure.

**Correct Answer:** C. Strangulated femoral hernia.