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

　　 Mullentowns manufacturing plants are not the only source of pollution there.

　　 Detailed plans would reveal that measures to reduce released pollutants would also reduce manufacturers costs for materials， waste disposal， and legal services

　　 Pollutants that manufacturing processes create but that are not released directly into the environment must nonetheless be collected and prepared for disposal

　　 Any reductions in pollutants released from Mullentowns manufacturing plants would not be noticeable for at least five years.

　　 Each manufacturer will be required to submit its plan to a committee appointed by Mullentowns officials.

　　3 Until 1984 only aspirin and acetaminophen shared the lucrative nonprescription pain-reliever market. In 1984， however， ibuprofen was expected to account for fifteen percent of all nonprescription pain-reliever sales.On that basis business experts predicted for 1984 a corresponding fifteen percent decrease in the combined sales of aspirin and acetaminophen.

　　The prediction mentioned in the last sentence above was based on which of the following assumptions?

　　 Most consumers would prefer ibuprofen to both aspirin and acetaminophen.

　　 Aspirin， acetaminophen， and ibuprofen all relieve headache pain and muscular aches， but aspirin and ibuprofen can also cause stomach irritation.

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