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.
Eliminate.
B. Seven years ago, the Woodco plant installed equipment to increase production capacity without increasing annual pollutant emissions.
This makes no difference. It has already been stated that the plant has followed the regulations.
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 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.
After all, if a new plant opened after the regulations were implemented, then it could be that emissions from that 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 emissions in general do.
That fact weakens the case for the conclusion that " the high rate was never a result of pollution from our 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