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The correct answer is option 1, the left atrium.
When blood becomes oxygenated in the lungs, it is transported back to the heart through the pulmonary veins. The pulmonary veins carry the oxygenated blood to the left side of the heart. The left atrium is one of the chambers of the heart that receives this oxygenated blood.
The left atrium then contracts, pushing the blood into the left ventricle. The left ventricle is responsible for pumping the oxygenated blood out of the heart and into the rest of the body through the aorta. It is worth noting that the left ventricle is the main pumping chamber of the heart and is larger and more muscular than the other chambers.
So, while the other options may be part of the circulatory system, they do not accurately represent where the oxygenated blood from the lungs is received. Therefore, the correct answer is option 1, the left atrium.