To determine which bacteria (A or B) grow best at a pH of 8 based on the graph, you would need to look at the growth curves for both bacteria at that specific pH level.
If the graph shows that:
- Bacteria A has a higher growth rate at pH 8 compared to Bacteria B, then the answer would be (c) Bacteria A.
- If Bacteria B has a higher growth rate at pH 8 compared to Bacteria A, then the answer would be (b) Bacteria B.
- If both bacteria show similar growth rates at pH 8, then the answer would be (a) Bacteria A and B.
- If neither show significant growth at pH 8, then the answer would be (d) Neither Bacteria A and B can survive a pH of 8.
Without being able to see the graph, I cannot provide a definitive answer, but you can use this reasoning based on the observations from the growth curves.