Figure 24-2 The Wall of the Small Intestine

Use Figure 24-2 to answer the following questions:
-Which of the following is not true of the structure labeled "5"?

A) contributes to the mesentery of the small intestine
B) has a simple squamous epithelium
C) is part of the visceral peritoneum
D) is called the serosa
E) contains mucus glands