Pepsin and Trypsin Are Digestive Enzymes

Pepsin and trypsin are digestive enzymes. In the stomach, normal pH is 2, while in the small intestine, normal pH is about 7.5. Based on this information and the accompanying figure, ____.

A) trypsin functions optimally in the small intestine
B) trypsin functions optimally in the stomach
C) both trypsin and pepsin function optimally in the stomach
D) both trypsin and pepsin function optimally in the small intestine
E) both pepsin and trypsin function equally well in the stomach and the small intestine