The correct option is
C Pleural membrane
D. Pleural membrane
Reason: A thin, moist, slippery double layered membrane which covers the lung, is known as Pleura. The inner layer or visceral pleura is firmly attached to the surface of the lung. At the hilum, the visceral pleura is continuous with the outer layer or parietal pleura that lines the wall of the thorax. Between the two layers is the intrapleural space, which normally contains fluid secreted by the membranes. so the correct option is D.