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Information and IdeasVery hardFinding weakening a credit claim

Information and Ideas practice question

A city claims that its new recycling programme is responsible for the 20 percent drop in the city's landfill waste since the programme began.

Which finding, if true, would most directly weaken the city's claim?

  1. A. A large packaging factory, previously the city's biggest single source of landfill waste, closed in the same month the programme began.Correct
  2. B. Residents surveyed say they find the programme easy to use.
  3. C. The amount of material collected for recycling has risen by 30 percent.
  4. D. Landfill waste in neighbouring cities rose over the same period.

Answer: A. A large packaging factory, previously the city's biggest single source of landfill waste, closed in the same month the programme began.

If the largest source of landfill waste disappeared at the same moment, the 20 percent drop could be the factory's closure rather than the programme.

Why the other answers are wrong

B. Residents surveyed say they find the programme easy to use.
Ease of use, if anything, supports the idea that the programme is working.
C. The amount of material collected for recycling has risen by 30 percent.
More recycling collected supports the claim.
D. Landfill waste in neighbouring cities rose over the same period.
Rising waste elsewhere makes the city's drop look MORE like the programme's doing, not less.

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