Earlier quoted context omitted.
The point is that whatever trait drags the US average performance down probably lives in the student body rather than the school system. If so, there isn't a lot we can do about it.
Quite the pessimist! So you're going w/ B) A subtle entreaty to focus the brunt of America's educational efforts on specific ethnic subgroups so that the entire nation can have better results. The upside is that it's possible that whatever procedural improvements are made will probably improve all of the student body, so it's a win-win! Unless, of course, you're also positing that these sub-groups can't be taught??
Unless you can demonstrate that this is cost effective, I'm certainly not.
And yes, I do generally posit that most educational interventions are ineffective. If you disagree, please point to one which can reliably and scalably increase the score of any group by an amount proportional to the black/white (or white/asian) gap.