List the Sections of the Small Intestine as They Occur

List the sections of the small intestine as they occur between the stomach and the large intestine:
1 Ileum
2 Duodenum
3 Jejunum

A) 1, 2, 3
B) 2, 1, 3
C) 3, 2, 1
D) 2, 3, 1
E) 3, 1, 2