PH and enzyme activity questions please help

1. PH of 3. As you can see, this is where the enzyme is at 100%
2. The probable PH for enzyme A between 1.5-2.5 as the stomach requires a very acidic pH to maintain digestive health
3. Enzyme A does not work at a PH of 6
4. Enzyme B is working at its maximum rate at a PH of 8
5. The probable PH of enzyme B is 5.5-7.0 as Luminal pH in the proximal small bowel ranges from 5.5 to 7.0
6. If enzyme A were produced in the intestine it would not carry out its usual function of digestion. Not only would the stomach acid likely cause damage to the intestine, a PH closer to neutral is required for absorption of nutrients to occur