Put the following layers of the digestive tract wall in order from the lumen to the deepest layer.
1) lamina propria
2) muscularis externa
3) submucosa
4) digestive (mucous) epithelium
5) serosa
6) muscularis mucosae
A) 5, 2, 3, 6, 1, 4
B) 4, 1, 6, 3, 2, 5
C) 4, 6, 3, 1, 2, 5
D) 5, 4, 2, 6, 1, 3
E) 1, 4, 3, 6, 2, 5