What Is the Significance of the Respiratory Membrane to Facilitate

What is the significance of the respiratory membrane to facilitate gas exchange?

A) All three surfaces are kept moist through interstitial fluid exchange.
B) Epithelial and endothelial cells share a common basement membrane.
C) The surface area is increased with this membrane.
D) Its thickness prohibits the alveoli from pulling away from the capillary.
E) It is covered with surfactant to accelerate gas exchange.