WeakenDiff: Easy
Logic Breakdown
Passage Summary: Since we don't know what most of the ingredients in any detergent actually do to nature, we shouldn't assume the ones labeled 'eco-friendly' are any better than the regular stuff.
Conclusion: There is no reason to believe that 'ecologically friendly' laundry detergents are less harmful to the environment than standard detergents.
Reasoning: All detergents contain harmful surfactants, and the environmental impact of the remaining ingredients in both types of detergent is largely unknown.
Analysis: The argument suffers from an 'absence of evidence' flaw, assuming that because we don't know the effects of most ingredients, there is no difference between the products. To weaken this, look for an answer that provides a reason to distinguish between the two, such as evidence that the 'unknown' ingredients in eco-friendly brands are actually safer or that they contain fewer harmful surfactants. Just because we lack complete data doesn't mean we have zero reason to favor one over the other. It's a bit like saying we have no reason to prefer a mystery box over a box of snakes just because we haven't opened the mystery box yet.
Conclusion: There is no reason to believe that 'ecologically friendly' laundry detergents are less harmful to the environment than standard detergents.
Reasoning: All detergents contain harmful surfactants, and the environmental impact of the remaining ingredients in both types of detergent is largely unknown.
Analysis: The argument suffers from an 'absence of evidence' flaw, assuming that because we don't know the effects of most ingredients, there is no difference between the products. To weaken this, look for an answer that provides a reason to distinguish between the two, such as evidence that the 'unknown' ingredients in eco-friendly brands are actually safer or that they contain fewer harmful surfactants. Just because we lack complete data doesn't mean we have zero reason to favor one over the other. It's a bit like saying we have no reason to prefer a mystery box over a box of snakes just because we haven't opened the mystery box yet.
Passage Stimulus
Passage Redacted
Unlock Full Passage9.Which one of the following, if true, most weakens the argument?
Correct Answer
A
If eco-friendly detergents contain much lower amounts of surfactants—the one ingredient we are told harms aquatic life—then there is a concrete, known reason to think they are less damaging. That directly undercuts the claim that there’s “no reason to suppose” they’re less damaging.
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