Argument: Since the new security guard was hired, thefts in the market have fallen, so the guard is responsible for the fall. Which of the following, if true, most weakens the argument?
Correct answer B. Thefts fell by the same amount in neighbouring markets that hired no new guards
Explanation
If thefts dropped equally where there was no new guard, something else probably caused the fall. The guard's hours, background or popularity do not challenge the claim.
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