Question

Why will a decrease in pH of the stomach affect protien digestion?
A) decrease in pH of the stomach will distort the structure of peptides in food, which affects the action of the enzyme pepsin.
B) decrease in pH of the stomach will distort the active site of the enzyme pepsin, which affects it's action
C) decease in pH of the stomach will distort the active site of the enzyme lipase, which affects protein digestion.
Please help!