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IMO C

he argument suggests that taxing polluting commercial establishments based on the volume of air pollution or greenhouse emissions will encourage these businesses to reduce their emissions, thereby helping protect the city's air quality. To determine the underlying assumption that supports this conclusion, let's examine each answer choice:

A. Businesses will reduce the amount of pollution they emit by reducing the number of products they build.

This choice specifies a method by which businesses might reduce pollution (reducing production), but the argument does not depend on this specific method being used. Businesses could also adopt cleaner technologies or improve efficiencies to reduce emissions. Thus, this is not a necessary assumption.
B. The tax will not significantly affect the commercial health of most businesses, even if their factories do not reduce the amount of pollution they emit.

This choice addresses the potential economic impact of the tax on businesses. While the economic impact is a consideration, the argument assumes that the tax itself will be effective in reducing pollution irrespective of its economic impact. The assumption that the tax will not cripple businesses economically is not directly required for the argument that the tax will lead to reduced emissions.
C. The tax will not induce businesses to dispose of their greenhouse gas pollution covertly.

This choice directly addresses the possibility of businesses finding alternative, perhaps unethical or illegal, ways to manage or misreport their emissions rather than actually reducing them. If businesses simply shift their pollution rather than reducing it, the tax would not achieve its intended effect of reducing emissions. Thus, the argument assumes that businesses will comply with the spirit of the law and not engage in such covert activities.
D. The quality of the air is an important issue for most of the city's residents.

While public concern might be relevant to the motivation for implementing a tax, it is not essential to the argument's logic that taxing emissions will lead to reduced emissions. The argument does not depend on public opinion but on the behavior of businesses in response to the tax.
E. Polluted air could be purified and cleaned of greenhouse gases through technology installed at company factories at the point of emission.

This choice suggests a method for reducing pollution, similar to A. However, the argument assumes that businesses will find a way to reduce emissions, which could include technology, but it does not depend specifically on the adoption of purification technology.
From these analyses, Option C is the assumption made in the conclusion. The effectiveness of the tax in reducing emissions assumes that businesses will not find covert ways to evade the environmental intent of the tax. If businesses were to dispose of their pollution covertly, the tax would not lead to the intended reduction in emissions, thus failing to protect the city’s air as predicted.
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Bunuel
­If the city goes on polluting the air at present rates, air quality and visibility over the city will begin to suffer, rainwater may be polluted, and the city will contribute to the global problem of greenhouse emissions. Taxing every polluting commercial establishment per volume of polluted air or per particulate volume of greenhouse emissions will induce businesses to reduce the amount of pollution they emit; this charge will therefore protect the city's air.

Which of the following is an assumption made in drawing the conclusion above?

A. Businesses will reduce the amount of pollution they emit by reducing the number of products they build.

B. The tax will not significantly affect the commercial health of most businesses, even if their factories do not reduce the amount of pollution they emit.

C. The tax will not induce businesses to dispose of their greenhouse gas pollution covertly.

D. The quality of the air is an important issue for most of the city's residents.

E. Polluted air could be purified and cleaned of greenhouse gasses through technology installed at company factories at the point of emission.
­
­

OFFICIAL EXPLANATION:



Reading the question: the prompt concerns a plan, and we need to find an assumption in the plan. Plans tend to have lots of assumptions, but they can be difficult to think of. We tax polluters, so they pollute less--no assumption jumps out. Without a specific prediction, therefore, we can apply a basic filter to each answer choice: does it have any relevance to whether the plan will work?

Applying the filter: We test the choices for relevance to the plan. In choice (A), reducing pollution is part of our conclusion, but the "number of products" need not be part of it. Choice (B) is not critical to the argument; it doesn't say or claim or require that businesses will like the tax or even survive it. Choice (C) looks relevant. Choice (D) is irrelevant to whether the tax will work. And choice (E) is not required for the plan to work, as we can see by a negation test: say there isn't a way to purify gasses at the point of emission. They could still pollute less, by producing less, or by capturing the air and shipping it into space in sealed containers, or whatever. So choice (E) is out.

Logical proof: We're left with (C), so we apply the negation test. Negating it, we get, "The tax will induce businesses to dispose of their greenhouse gas pollution covertly." That statement, if true, deals a severe blow to the argument. The plan won't achieve its aim if polluters continue to pollute covertly. Choice (C) is indeed critical.

The correct answer is (C).
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