(C) (b) and (c)
Statement (b) is correct — left atrium transfers oxygenated blood to left ventricle, which pumps it to the body. Statement (c) is correct — right atrium receives deoxygenated blood via vena cava.
From the passage: "Oxygen-rich blood from the lungs comes to… the left atrium… the left ventricle contracts… the blood is pumped out to the body. De-oxygenated blood comes from the body to… the right atrium." Statement (a) is wrong because oxygenated blood comes via pulmonary veins, not pulmonary artery. Statement (d) is wrong because the left ventricle (not left atrium) pumps blood into the aorta.