varundixitmro2512 wrote:
Why not D
If there are other sources of pollutants then health decline will not be because of new plant.
The recent construction of the chemical plant on the shores of Lake Blue has introduced a new pollutant into the water: toxidil. Toxidil first works its way into the ecosystem through the underwater plant life. These plants absorb the pollutant, which is then transmitted to the local fish population when the vegetation is ingested. Fish so tainted appear healthy, but their meat, when consumed by humans, leads to serious health problems. The population living in the vicinity of Lake Blue will undoubtedly suffer a decline in health due to the new chemical plant.
Which of the following is an assumption necessary for the author's conclusion?
(A) Other pollutants are not also detrimental to human health.
(B) The fish in Lake Blue are consumed by the people who reside nearby.
(C) The first reported incidences of fish tainted with toxidil occurred in Lake Blue, and not elsewhere within Canada or the United States.
(D) Currently, the only source of toxidil in the world is the chemical plant at Lake Blue.
(E) Banning chemical processes that produce toxidil will merely cause the owners of the chemical plant to continue these same processes in secret at Lake Blue.
The question stem is asking for an assumption.
Conclusion is :
The population living in the vicinity of Lake Blue will undoubtedly suffer a decline in health due to the new chemical plant.This is based on the assumption that people living nearby eat the fish from that lake.
If people don't eat fish from the lake they wont get the toxin into their bodies. Negating this will shatter the conclusion.
As to why d is wrong, Pay attention to the argument structure.
We dont care of there are any other sources. If there are other sources how does that affect the conclusion.
It doesn't shatter it if there are other sources of the Toxin.
Hard and fast rule to find the correct assumption.
Negate it. if negating the assumption shatters the conclusion then its the right one.
Hope i made it clear.