Highly skilled workers in Eastern Europe have left jobs to emigrate West
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Skilled workers who remain in Eastern Europe are in high demand in their home countries
So this argument is making a few assumptions: (1) It assumes that there already was not an overabundance of skilled workers to begin with. Maybe these highly skilled workers flooded the job market and over saturated it and, thus, when they left, more workers wouldn't really be in demand. (2) It also assumes that these workers are going to be replaced. Maybe the companies realized that they are better off without these workers and so they are just going to eliminate those jobs of the people that left. (3) It makes a small assumption about where these skilled workers are from. While the argument is saying that these workers will be in demand if they "remain" in Eastern Europe, it never mentions another about their "home countries." Thus, since the argument is concluding that these workers will be in high demand in their home countries, there could also be a correct answer saying something like, "Most of the skilled workers living in Eastern Europe now are from the United States, where which the job market is flooded with skilled workers."
- (A) I think this is a tricky one. I thought it looked really good initially. However, "preferring" to hire workers from their home countries rather than importing workers actually seems to strengthen the argument a tiny bit. Sure, "preference" is not really indicative that there is "high demand" but it helps a tad. Either way, this answer choice absolutely does not weaken. We want an answer choice that says that these workers really still aren't in high demand.
(B) gives us this. This is very similar to what I predicted in (2). If workers are leaving but their jobs are going to be eliminated anyway, we start to have a little bit of doubt that there will be a "high demand" for new workers. Why would there be? Many positions are going to get eliminated! If there WAS a "high demand," there would be no need to eliminate these positions!
(C) We don't care about those expatriates that ditched their Eastern European homeland! We are care about those people that stayed!
(D) This actually strengthens a tiny bit because it shows a willingness for the Eastern Europeans to get back some skilled workers. If they plan to train them then we can assume that they need some more workers. If they need some more workers then I could safely say that there is some demand for workers!
(E) Also strengthens as tiny bit. These jobs are unfilled! Let's fill them!