Question Type:
Necessary Assumption
Stimulus Breakdown:
Conclusion: Countries can figure out the best public school system for their country by looking at other countries.
Evidence: We could give nationwide tests in every country, and whichever country has the best scores on the tests would be the "model" school system.
Answer Anticipation:
This argument seems less about sorting out the Missing Links/Ideas and more about thinking of Potential Objections. How would we argue AGAINST this plan? We could say that no test provides a good enough metric to make us believe that "doing best at the test" = "best type of school system". We could also raise typical Comparison concerns and say, "Who's to say that a school system that performs well in Norway will perform comparably well in China?" Maybe there are different cultural / economic barriers that would preclude a system that works well in one place from working well in a different place.
Correct Answer:
A
Answer Choice Analysis:
(A) This looks good! If we negate this, we get a pretty massive objection to the plan: "a type of system that works well in one country would NOT necessarily work well in other countries".
(B) Nothing about this conversation cares about the existence of private schools. If we negated this, we'd be saying "at least some countries are 100% public school". Cool, so what?
(C) You would hope this is true, but the argument doesn't hinge on it. If we negate this and say, "Hey, author, we WON'T be able to figure out which aspects of a given system are making it perform better/worse", she'll just say "Who cares? Just completely adopt whichever system performs best!"
(D) Extreme = "Most". It wouldn't make any difference to this argument whether 49% or 51% of countries already have nationwide tests.
(E) Extreme = "as closely as possible". Again, you'd hope this would be true, but the argument doesn't hinge on it. The testing doesn't have to create the BEST POSSIBLE matches between grade levels, because the author never gets into that level of detail. It's possible that the author would be content with a system of tests that roughly approximates comparable grade levels.
Takeaway/Pattern: When an argument feels like a Plan of Action, try to think about possible ways it could fail to work the way the author envisions. And whenever the author is thinking, "if it's true over HERE, it should be true over THERE" look out for comparison assumptions (strengthen with more similarity / weaken with meaningful differences).
#officialexplanation