The correct answer is option 4, pleural cavity. Lungs are not located in the abdominal cavity (option 1) as this is where organs such as the stomach and intestines are located. They are also not located in the pericardial cavity (option 2), which houses the heart. The peritoneal cavity (option 3) contains organs such as the liver, spleen, and kidneys. The lungs are specifically located in the pleural cavity (option 4), which is a space between the two layers of the pleura, a membrane that surrounds the lungs. The pleural cavity helps protect the lungs and allows for their expansion and contraction during breathing.