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Strengthen. The correct answer choice is (C)
The author begins by describing how the planners in "some countries" have attempted to solve the problems resulting from increasing urbanization. You can be sure that her argument will proceed by introducing an alternative: instead of reducing migration from rural areas into the cities, why not trade the products and services produced by a predominantly urban population to import the agricultural products previously produced in rural areas? Of course, this would only solve the problems affecting the scarcity of agricultural products. What if urbanization also leads to overcrowding, polution, health hazards, etc.? The economists are silent on these issues, which is why their solution is potentially flawed. Since your job is to strengthen their argument, look for an answer choice that eliminates the need to address them. This, in so many words, is answer choice (C).
Answer choice (A): This answer choice does the exact opposite of what is needed: it weakens the economists' solution by suggesting an alternative approach to mitigating the effects of urbanization.
Answer choice (B): This answer misses the point of the argument, which is about the effects of urbanization and not its causes. Furthermore, either of the two solutions proposed in the stimulus can be seen as economic: this answer choice fails to explain why the economists got it right while the national planners did not and is therefore incorrect.
Answer choice (C): This is the correct answer choice. It provides the much needed link between the scarcity of agricultural products and the problems created by urbanization. Without this connection, the economists' solution makes little sense.
Answer choice (D): Even if trade imbalances are at the root of urbanization, it is unclear how the solution proposed by the economists will affect them. This answer choice is incorrect.
Answer choice (E): Clearly, if free trade policies can exacerbate the problems caused by urbanization the economists' solution may be flawed. This answer choice therefore does the exact opposite of what is needed and is incorrect.