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Critical Reasoning: Conclusion Strengthening Questions

A new hybrid motorcycle runs on both standard gasoline and electricity. However, it is believed that because every automatic switch between the use of gasoline and electricity results in a massive expenditure of gasoline, driving the new motorcycle has the same detrimental effect on the environment as the average motorcycle, which runs solely on gasoline.

Which of the following, if true, most strengthens the argument above?

Incorrect.

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This answer choice neither weakens nor strengthens the conclusion. Since we are interested in relative petrol consumption, the preference of the motorcycling community is irrelevant and cannot help us support the conclusion.

Incorrect.

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This answer choice neither weakens nor strengthens the conclusion. Since we are interested in the effect of driving the hybrid engine, not producing it, the production process is irrelevant and cannot help us support the conclusion.

Incorrect.

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This answer choice neither strengthens nor weakens the conclusion. Specific problems in the current performance of the hybrid motorcycle in certain cities are irrelevant to the argument. We are interested in a technical comparison (i.e., the potential and not the current performance) of hybrid and gasoline motorcycles.

Well done!

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This answer choice supports the conclusion by confirming the assumption that the carbon dioxide emissions of both engines are the same, proving that the bikes both have the same detrimental effect on the environment.

Incorrect.

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This answer choice presents information that neither strengthens nor weakens the conclusion. The ability to make further improvements on both kinds of engines is irrelevant to the argument since it does not help us determine whether the hybrid engine is as damaging to the environment as the standard gasoline engine.

Because the motorcycling community is more ecologically minded than five years ago, it will prefer, all other things equal, to purchase a hybrid motorcycle over a regular gasoline one.
The production process of hybrid engines consumes a very large amount of energy, thereby negating its positive effect on the atmosphere. 
Due to the scarcity of charging stations for the hybrid motorcycle in some cities, it has not yet reached its full potential of reducing the detrimental ecological implications of its usage.
A pollution tester, attached to the exhaust pipe, showed the amount of carbon dioxide emitted by a hybrid after 500 miles to be the same as that of the gasoline-consuming engine.
Both the gasoline-run motorcycle and the new hybrid engine can be made more environmentally friendly by the addition of cleansing agents to the petrol.