The correct answer is option 2, Right Atrium. The human heart has four chambers: two atria and two ventricles. The atria are the upper chambers of the heart, and the ventricles are the lower chambers.

The right atrium receives deoxygenated blood from the body. This blood has already been used by the body`s cells and is low in oxygen and high in carbon dioxide. It is then pumped into the right ventricle through the tricuspid valve.

From the right ventricle, the deoxygenated blood is pumped into the pulmonary artery, which takes it to the lungs for oxygenation. In the lungs, carbon dioxide is released, and oxygen is absorbed into the blood.

The oxygenated blood then returns to the heart through the pulmonary veins, entering the left atrium. From there, it is pumped into the left ventricle, which is responsible for pumping the oxygenated blood out to the rest of the body through the aorta.

It is important to note that the left atrium, left ventricle, and right ventricle all receive oxygenated blood, while the right atrium receives deoxygenated blood.