The correct answer is B. Aorta.
The aorta is the largest artery in the human body. It carries oxygen-rich blood from the heart to the rest of the body. The aorta begins at the left ventricle of the heart and branches into smaller arteries that supply blood to the head, neck, arms, chest, abdomen, and legs.
The vena cava is the largest vein in the human body. It carries deoxygenated blood from the body back to the heart. The vena cava has two branches: the superior vena cava and the inferior vena cava. The superior vena cava carries blood from the upper body to the heart, while the inferior vena cava carries blood from the lower body to the heart.
Capillaries are the smallest blood vessels in the human body. They connect arteries to veins and allow oxygen and nutrients to pass from the blood to the tissues, and waste products to pass from the tissues to the blood.
Ventricles are the lower chambers of the heart. They pump blood out of the heart to the rest of the body. The left ventricle pumps oxygen-rich blood to the body, while the right ventricle pumps deoxygenated blood to the lungs.