Answer:

D.

Explanation:

Oxygen-poor blood returns from the body to the heart through the superior vena cava (SVC) and inferior vena cava (IVC), the two main veins that bring blood back to the heart.

Which blood vessels carry impure blood back to the heart?

A. aorta

B. arteries

C. capillaries

D. veins

The impure blood enters the heart from two large veins called the superior and inferior vena cava.

The blood from these veins enters the right upper chamber known as the Right Atrium.

This chamber also receives impure blood from the heart veins through the coronary sinus.

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