The graph illustrates how pH affects the activity of three different enzymes. The table gives the pH values for different regions of the alimentary canal: • mouth: $7.0$ • stomach: $2.0$ • small intestine: $8.5$ Which enzymes shown on the graph are most likely to be protease enzymes?
- AX, Y and Z
- BX and Z only
- CY and Z only
- DZ only