To determine the pH of each substance we need to compare the results obtained for them with each indicator.
Substance A:
We can see from the result of the indicator bromothymol blue the pH should be between 5 and 7. Also we get the same result from the indicator bromocresol green. We can then assume that the pH of substance A is around 6.
Substance B:
For this substance it is easy to see that all the indicators show that this substance has a pH of 11 as all the colours match for that value.
Substance C:
For this substance we can easily see that all the indicators show that the pH of it is 1 as all of them match the colours of that value.