**Core Concept**
Total anomalous pulmonary venous connection (TAPVC) is a congenital heart defect where the pulmonary veins do not connect normally to the left atrium, instead connecting to the right atrium or one of its tributaries. This anomaly disrupts the normal flow of oxygenated blood from the lungs to the left atrium, leading to a mixing of oxygenated and deoxygenated blood.

**Why the Correct Answer is Right**
The most common type of TAPVC is supracardiac, accounting for approximately 50% of cases. In this type, the pulmonary veins connect to the superior vena cava or one of its tributaries, such as the innominate vein. This connection occurs above the heart, which is why it's called supracardiac. The supracardiac type of TAPVC is often associated with a vertical vein, which is a dilated vessel that connects the pulmonary veins to the superior vena cava.

**Why Each Wrong Option is Incorrect**
**Option A:** **Infracardiac** is a less common type of TAPVC, where the pulmonary veins connect to the inferior vena cava or one of its tributaries, such as the hepatic vein. This connection occurs below the heart, which is why it's called infracardiac.
**Option B:** **Cardiac** TAPVC is a rare type where the pulmonary veins connect directly to the right atrium. This type is often associated with other cardiac anomalies.
**Option C:** **Mixed** TAPVC is a rare type where the pulmonary veins connect to both the left atrium and another cardiac structure, such as the right atrium or superior vena cava.

**Clinical Pearl / High-Yield Fact**
The supracardiac type of TAPVC is often associated with a characteristic "snowman" or "figure-of-eight" appearance on chest X-ray, due to the dilated vertical vein and the presence of a dilated superior vena cava.

**Correct Answer:** C. Cardiac TAPVC is a rare type where the pulmonary veins connect directly to the right atrium. This type is often associated with other cardiac anomalies.