**Core Concept**
The portal venous system is a network of veins that plays a crucial role in the hepatic circulation, facilitating the transport of nutrients, hormones, and waste products from the gastrointestinal tract to the liver for processing and detoxification.

**Why the Correct Answer is Right**
The portal venous system is formed by the confluence of the superior mesenteric vein and the splenic vein, which then drains into the inferior vena cava via the hepatic portal vein. This unique circuit allows the liver to filter and process the blood before it enters the systemic circulation. The hepatic portal vein is a key structure in this system, responsible for transporting blood from the gastrointestinal tract and spleen to the liver for processing.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the formation of the portal venous system.
**Option B:** This option is incorrect because it does not specify the correct vein that drains into the inferior vena cava.
**Option D:** This option is incorrect because it describes the hepatic portal vein as draining into the superior vena cava, which is incorrect.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the hepatic portal vein is a unique structure that allows the liver to filter and process blood from the gastrointestinal tract, making it a critical component of the hepatic circulation.

**Correct Answer:** C.