Woodco Plywood Manufacturer: Ten years ago a study linked the high rates of respiratory ailments in Loganville to airborne pollutants released in the manufacture of plywood. In response, the city government imposed strict regulations on emissions from our plant, which we have followed at great cost to our production capacity. But after an initial dip, the rate of respiratory ailments rose to new levels, so the high rate was never a result of pollution from our plant.Which of the following, if true, most seriously weakens the argument?A. Over the last decade, a series of studies linking respiratory ailments to dietary deficiencies has been published.If anything, this strengthens the case for the conclusion by suggesting that respiratory ailments are caused by something other than airborne pollutants.
Eliminate.
B. Seven years ago, the Woodco plant installed equipment to increase production capacity without increasing annual pollutant emissions.This makes no difference. Installing equipment to increase capacity without increasing emissions would not result in an increase in emissions or in the rate of ailments.
Eliminate.
C. Pollutant emissions at Woodco plywood plants in other towns have declined during the past twelve years.This makes no difference since it doesn't indicate anything about whether the emissions in those other towns cause ailments.
Eliminate.
D. Nine years ago, a competing plywood manufacturer opened a plant just across the river from Woodco’s plant.This choice is interesting.
The reasoning of the argument is basically that, since the rate of respiratory ailments increased after Woodco began following the regulations, and presumably reduced the quantity of pollutants released by the plant, pollution from the plant was never the cause of the ailments.
However, a new plywood plant opened after the regulations were implemented. So, so it could be that emissions from that plywood plant have caused the increase in ailments.
In that case, even though Woodco's plant itself may no longer be causing ailments, it could still be the case that, in general, pollution from plywood manufacturing does.
That fact weakens the case for the conclusion that "the high rate was never a result of pollution from our plant" because it indicates that the following could have happened:
Woodo plywood manufacturing pollution was making people sick. Then, Woodco started following the regulations, and the rate of ailments dipped. Then, the new plywood plant started up, and started causing ailments again.
So, this choice weakens the argument by indicating that plywood manufacturing pollution could have been the problem all along, first as caused by Woodco and now as caused by the new plant.
Keep.
E. There are more facilities for treating respiratory ailments in Loganville today than there were eleven years ago.This doesn't connect emissions to ailments. So, it doesn't affect the case for the conclusion.
Eliminate.
Correct answer: D