medium · GMAT Verbal

Which of the following, if true, most weakens the argument?

1. Sales of diet sodas rose last year even though no labeling laws had changed.
2. Printing the labels will raise production costs for beverage companies.
3. Most consumers already know these drinks are high in sugar but choose to disregard it.
4. The labels will be printed in high-contrast colors to ensure they are easily visible.
5. Clear labeling laws will completely eliminate obesity within a single year.

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