Garry performs an assay for protease function using casein as substrate. He finds it difficult to interpret the resulting plot (Figure left), so he alters the experimental protocol and collects another data set (Figure right), 100 100 75 75 50 50 . . 25 . 4 pH pH Which one of the following changes did Garry most likely make to his protocol? Select one: O a. Incubate the reactions at a lower temperature O b. Use more enzyme in each reaction O c. Incubate the reactions for a shorter time period