**Core Concept**
The patient's hypotension in the context of a road-traffic accident is likely due to internal bleeding, which can be caused by a ruptured organ. The spleen is a common site for such injuries due to its location in the upper left quadrant of the abdomen.

**Why the Correct Answer is Right**
The spleen is highly vascular and is more susceptible to injury in the setting of blunt trauma. A ruptured spleen can lead to significant internal bleeding, which can cause hypotension. The spleen's blood supply is primarily from the splenic artery, which branches off the aorta. The rupture of the spleen can lead to rapid blood loss into the peritoneal cavity, causing hypovolemic shock.

**Why Each Wrong Option is Incorrect**
* **Option A:** The liver is also a common site for injury in blunt trauma but is less likely to cause hypotension in the initial stages due to its large blood volume and ability to compensate for initial blood loss.
* **Option B:** The kidneys are also susceptible to injury but are less likely to cause significant bleeding in the early stages due to their ability to compensate for blood loss.
* **Option C:** The small intestine is a common site for injury but is less likely to cause significant bleeding due to its smaller blood supply.

**Clinical Pearl / High-Yield Fact**
In a patient with hypotension and a history of blunt trauma, a ruptured spleen should be considered in the differential diagnosis. A high index of suspicion and prompt imaging studies, such as an abdominal CT scan, are essential for early diagnosis and management.

**Correct Answer:** C.