请nn帮忙解释此题。
Neither a rising standard of living nor balanced trade, by itself, establishes a country's ability to compete in the international marketplace. Both are required simultaneously since standards of living can rise because of growing trade deficits and trade can be balanced by means of a decline in a country's standard of living.
If the facts stated in the passage above are true, a proper test of a country's ability to be competitive is its ability to____.
A. balance its trade while its standard of living rise.
B. balance its trade while its standard of living falls.
C.increase trade deficits while its standard of living rises
D.decrease trade deficits while its standard of living falls
E.keep its standard of living constant while trade deficits rise
此答案是选A. 我选的是C。我是这么思考的
trade deficits ↑ －>standards of living↑
standards of living↓－> trade balance
然后我根据这个公式回到题目去寻找哪个答案和这个公式是一致的。
但是看了正确答案候，发现似乎原文的第一句话就是答案。那么后面（用红字标注）又说那么多是干什么呢？
这是一个演绎题，从第一句给出了原则推出一个符合的现象。
红字是解释，说明为什么 ability 不能由单方面决定
standards of living can rise because of growing trade deficits
这句话就解释了C为什么不对了
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