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186 To prevent a newly built dam on the Chiff River from blocking the route of fish migrating to breeding grounds upstream, the dam includes a fish pass, a mechanism designed to allow fish through the dam. Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project`s completion, only 300 per day made the journey. Clearly, the fish pass is defective.Which of the following, if true, most seriously weakens the argument?
187 Music critic: Fewer and fewer musicians are studying classical music, decreasing the likelihood that those with real aptitude for such music will be performing it. Audiences who hear these performances will not appreciate classical music`s greatness and will thus decamp to other genres. So to maintain classical music`s current meager popularity, we must encourage more young musicians to enter the field. Which of the following, if true, most weakens the music critic`s reasoning?
188 Commemorative plaques cast from brass are a characteristic art form of the Benin culture of West Africa. Some scholars, noting that the oldest surviving plaques date to the 1400s, hypothesize that brass-casting techniques were introduced by the Portuguese, who came to Benin in 1485 A.D. But Portuguese records of that expedition mention cast-brass jewelry sent to Benin`s king from neighboring Ife. So it is unlikely that Benin`s knowledge of brass casting derived from the Portuguese.Which of the following, if true, most strengthens the argument?

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