The correct answer is B. Pleura.
The pleura is a thin, serous membrane that surrounds the lungs and lines the inside of the chest cavity. It helps to protect the lungs and keep them in place. The pleura also produces a fluid that helps to lubricate the lungs and reduce friction as they move.
The pericardium is a sac that surrounds the heart. It helps to protect the heart and keep it in place. The pericardium also produces a fluid that helps to lubricate the heart and reduce friction as it beats.
The peritoneum is a sac that surrounds the abdominal organs. It helps to protect the organs and keep them in place. The peritoneum also produces a fluid that helps to lubricate the organs and reduce friction as they move.
The meninges are three membranes that surround the brain and spinal cord. They help to protect the brain and spinal cord from injury. The meninges also produce a fluid that helps to cushion the brain and spinal cord.