The farmers in developing countries argue that US subsidies lead to a global surplus of wheat that keeps the price of wheat artificially low. D is a weaken because it presents evidence that the global supply of wheat would not be any lower without these subsidies. According to D, if the US dropped its subsidies and US farmers therefore reduced their production, other countries would simply increase their wheat production. Therefore, the subsidy cannot readily be blamed for the low price of wheat. If we want to dig deeper, we might also conclude that there must be demand for this wheat if other countries are ready to step up their supply. However, this doesn't need to be true--we simply need to know that the US subsidies are not creating a situation that would otherwise not exist.
C and E don't matter because they only talk about the absolute
prices of soybeans and sorghum, without any comparison to what they would be if subsidies were removed or added. Imagine that I said this: "When I went car shopping, I was wearing a designer suit. I think the car dealer overcharged me because I appeared wealthy." Now imagine that my brother responded like this: "But the other day when I bought an iPod, I was wearing a similar suit, and I paid much less for my iPod than you did for your car." His response is silly, right? He paid less for the iPod because iPods are less valuable than cars (at least, in most cases). Just knowing that one value is more or less than the other tells us nothing about the effect of our appearance. Did I pay too much? Did my brother? We'll only know if we look at what someone less nicely dressed paid for the same item.
Similarly, in the case of the crops in our original argument, just knowing that one value is more or less than the other tells us nothing about the effect of subsidies. Maybe the price of sorghum is low because it is cheap to produce, or because it is not in high demand.
By the way, I notice that you are using two v's in place of the letter w. Those are not the same thing! It's weaken, not vveaken . . .
I hope this helps! Let me know if I can elaborate on any of the above.
Dmitry Farber | Manhattan GMAT Instructor | New York
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