21. When limitations were in effect on nuclear-arms testing, people tended to save more of their money, but when nuclear-arms testing increased, people tended to spend more of their money. The perceived threat of nuclear catastrophe, therefore, decreases the willingness of people to postpone consumption for the sake of saving money.
The argument above assumes that
A. the perceived threat of nuclear catastrophe has increased over the years.
B. most people supported the development of nuclear arms
C. people’s perception of the threat of nuclear catastrophe depends on the amount of nuclear-arms testing being done
D. the people who saved the most money when nuclear-arms testing was limited were the ones who supported such limitations
E. there are more consumer goods available when nuclear-arms testing increases
求助：这题答案为C。可我看了解释还是没有明白所以然，特别对于第一句“When limitations were in effect on nuclear-arms testing, people tended to save more of their money”的作用感到疑惑，为何后面的句子要用“but"连接。
望大牛们相助！！
题干中的but 表达是前后两个不同时间状语条件下得到的相反结果，并不是暗含的推论转折。
结论perceived threat of nuclear catastrophe 推出decreases the willingness of people to postpone consumption for the sake of saving money
C. people’s perception of the threat of nuclear catastrophe depends on the amount of nuclear-arms testing being done
把结论AB联系起来了，A perception of the threat of nuclear catastrophe ；Bthe willingness of people to postpone consumption。B 在论据中体现为nuclear-arms testing 影响着人们的消费选择 ，而 amount of nuclear-arms testing being done和 nuclear-arms testing对应。
所以C
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