Which of These Statements About Serous Membranes Is True

Which of these statements about serous membranes is true?

A) Serous membranes line cavities that open to the outside of the body.
B) Visceral serous membranes are in contact with internal organs.
C) Retroperitoneal organs are surrounded by both parietal and visceral serous membranes.
D) Serous membranes surround the pleural and peritoneal cavities, but not the pericardial cavity.
E) All of these are true.