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The level of industrial pollutants in the water bodies of the state has fallen by an average of 20% in the last five years. While the ruling party takes the credit for it, attributing it to the Clean Water Act passed five years ago, the opposition attributes it to the recession suffered in the past few years, which resulted in the closure of 10% of the business and unemployment in the industrial sector rising by 15%. It is probable that the business decline, rather than the regulation in the act, is responsible for at least half of the decline in the pollution.

Which of the following is an assumption made in the passage above?

A. The amount of water pollution in a given area is proportional to the number of business and workers active in that area.

B. Industrial activity alone is responsible for all the pollution in water bodies.

C. Most businesses in the state have obeyed the regulations embodied in the Clean Water Act.

D. The Clean Water Act has succeeded only marginally in reducing the pollution in water bodies.

E. The recession in the state is due, at least in part, to the effects of the Clean Water Act.
plz help me with this question
How can option A is correct is it necessary to have ''water pollution in a given area is proportional to the number of business and workers active in that area'' to make our conclusion valid . If we negate it how do it shatters our conclusion.
THANK YOU
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honey1

plz help me with this question
How can option A is correct is it necessary to have ''water pollution in a given area is proportional to the number of business and workers active in that area'' to make our conclusion valid . If we negate it how do it shatters our conclusion.
THANK YOU
Hello, honey1. If you tuck in a not between is proportional in the answer choice, then you should be able to see that it does, in fact, derail the argument. Look at the argument again, filling in the supporting numerical information as necessary:

It is probable that the business decline—which resulted in the closure of 10% of the business [in the industrial sector] and unemployment in the industrial sector rising by 15%—rather than the regulation in the act, is responsible for at least half of the decline in the pollution.

If the 10 percent decline in the number of industrial businesses and the 15 percent rise in industrial sector unemployment cannot be equated somehow to the 20 percent decline in the level of industrial pollutants in the water bodies, then there would be no grounds for making such an argument as the one above. That is why I underlined the word probable above. Moreover, if you examine the other answer choices, you should appreciate that none of them, with or without negation, will have any bearing on the argument presented. If you feel differently, I will hear you out.

I hope that helps. Good luck with your studies.

- Andrew
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