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Beverage company representative: The plastic rings that hold six-packs of beverage cans together pose a threat to wild animals, which often become entangled in the discarded rings and suffocate as a result. Following our lead, all beverage companies will soon use only those rings consisting of a new plastic that disintegrates after only three days' exposure to sunlight. Once we all complete the switchover from the old to the new plastic rings, therefore, the threat of suffocation that plastic rings pose to wild animals will be eliminated.
Which one of the following, if true, most seriously weakens the representative's argument?
A. The switchover to the new plastic rings will take at least two more years to complete. B. After the beverage companies have switched over to the new plastic rings, a substantial number of the old plastic rings will persist in most aquatic and woodland environments. C. The new plastic rings are slightly less expensive than the old rings. D. The new plastic rings rarely disintegrate during shipping of beverage six-packs because most trucks that transport canned beverages protect their cargo from sunlight. E. The new plastic rings disintegrate into substances that are harmful to aquatic animals when ingested in substantial quantities by them.
The answer key says B is right... i would like to know why D is wrong.......My line of reasoning is this.....since they are not exposed to sunlight,they don't disintegrate ..which implies animals could suffocate and this would weaken the argument.......
Well the rep doesn't claim that the rings will disintegrate out of sunlight (and if they did they would be useless). The representative DOES however claim that after the switchover "the threat of suffocation that plastic rings pose to wild animals will be eliminated".
Answer B indicates that lots of the old rings will still exist and that the threat of suffocation will still persist after the companies switch over.