Final answer:
Deoxygenated blood leaves the right ventricle and is transported to the lungs through the pulmonary arteries. After being oxygenated in the lungs, the blood returns to the heart and enters the left atrium.
Step-by-step explanation:
The correct answer is c. Right ventricle; left atrium. Deoxygenated blood leaves the right ventricle of the heart and is transported to the lungs through the pulmonary arteries. After being oxygenated in the lungs, the blood returns to the heart and enters the left atrium.