Great question - on Strengthen/Weaken questions you want to first identify the conclusion that you're supporting/attacking, so please do make that an emphasis. The four common ways to determine a conclusion are to look for:
1) Conclusion language like “thus” or “therefore”
2) A call for action, such as “we should…” or “they must…”
3) The effect of a cause-and-effect relationship. For example, “Because it is raining, the parade will be canceled.” The parade being canceled is a conclusion dependent on the rain.
4) The “Why” test. The “Why” test dictates that CR arguments are comprised of only two things: facts and conclusions. And conclusions need to be based on facts. If you ask “why is that true” of a statement, and realize that the paragraph gives no attempt at a reason for it, that statement must be given as a fact – no reason is necessary. But if a reason is given – if you can point to another sentence after asking “why,” then the statement that depends on another is likely the conclusion.
If you want to break this process down with an example, I recommend this blog post: http://www.veritasprep.com/blog/2010/11/gmat-tip-of-the-week-jump-to-conclusions/
Now, on this question, it's actually not a straight Weaken question - this is one that involves a plan or strategy. On Plan/Strategy questions, the "objective" is the "conclusion" - your job isn't to weaken an argument, but rather to demonstrate that the government's plan won't likely reach its objective.
So here, you'd want to use "to help businesses (who are hamstrung by a lack of available loan money)" as the "conclusion". The government aims to do that by cutting personal taxes so that people invest more and that money becomes available. As daagh notes, A weakens that plan by showing that individual consumers will borrow that increase in available loan funding, meaning that the plan won't actually increase the pool available "to help businesses".
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