Multiple Choice. Gastrointestinal hormones are reflexively released when chyme arrives in the duodenum.?

Gastrointestinal hormones are reflexively released when chyme arrives in the duodenum. Which of the following factors is responsible for stimulating these reflexes? A) Acidity of the chyme B) Presence of fatty acids in the chyme C) Presence of amino acids in the chyme D) Rising osmotic concentration of the chyme E) All of the above