These are values in Q. They are not contained in B.

This looks convincing. In fact, that response alone cancels the other questions i would have asked.

But they do bound B from above ^^

But then this seems to be complicating your response.

The values you presented don't follow the rules of B ( for example, r = √1.5 or √(15/10) isn't a rational number). So my question, bound B in what context ?