Reg Yular Noticed That Every Morning After Breakfast,he Had a Bowel

Reg Yular noticed that every morning after breakfast,he had a bowel movement,regardless of the amount he ate.Since he knows you are a student of physiology,he inquires why this happens and you explain

A) that some meals,especially breakfast,trigger mass movements in the colon.
B) that movement of feces into the rectum initiates the defecation reflex.
C) that his colon responds to a new day by initiating the defecation reflex.
D) that he was trained very well when he was young.
E) Both that some meals,especially breakfast,trigger mass movements in the colon and that movement of feces into the rectum initiates the defecation reflex are needed to completely explain the phenomenon.