急！！！请教一个逻辑题

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

这题的答案为什么是C不是A啊？题干中的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.不就是C的意思吗？为什么说C是假设啊，我觉得A更好一点，因为结论中的 The perceived threat of nuclear catastrophe没提到是增加核试验还是减少核试验，而结论是人们扩大了消费，所以我觉得答案应该是A

不知道我这样理解是不是有偏差，请各位赐教！谢谢大家！

明白了，谢谢哈！