Country M has a new immigration policy allowing those who

I'm not going to offer a full run-down here because this is not a very GMAT-like problem. It has a number of flaws, but I'll just point out one. It says that the quotas would be based on previous levels, but it doesn't make it clear what that means. What if the quotas were actually lower for countries that had already sent a lot of immigrants?

Anyway, D is indeed the best answer. Most of the other answers are wrong because they don't address the specific question we've been asked (this is a big issue in CR). C, for instance, would be lovely, right? This citizen will solve all the political problems of his country and there will be no more need for asylum. We can ignore the unrealistic nature of this (that's one powerful citizen!) and just focus on how it relates the question, which asks us to minimize the effect of the quotas on the emigration attempts of people from J. Reducing people's need to emigrate might stop them from emigrating, but it wouldn't reduce the effect on their emigration attempts. If anything (assuming we ignore the flaw I mentioned earlier), anyone who did attempt to emigrate would face a harsher quota than if there were great waves of people coming over the next 6 months.

I hope that helps. Now back to the OG! If you've exhausted that resource, get a 10th edition OG (less overlap than more recent editions) or the mba.com paper tests.