VeritasKarishma wrote:
ankit0411 wrote:
Rabbits were introduced to Numa Island in the nineteenth century. Overgrazing by the enormous population of rabbits now menaces the island’s agriculture. The government proposes to reduce the population by using a virus that has caused devastating epidemics in rabbit populations elsewhere. There is, however, a chance that the virus will infect the bilby, an endangered native marsupial. The government’s plan, therefore, may serve the interests of agriculture but will clearly increase the threat to native wildlife.
Which of the following, if true, most seriously weakens the argument?
A. There is less chance that the virus will infect domestic animals on Numa than that it will infect bilbies.
B. There are no species of animals on the island that prey on the rabbits.
C. Overgrazing by rabbits endangers many of the plants on which bilbies feed.
D. The virus that the government proposes to use has been successfully used elsewhere to control populations of rabbits.
E. There is no alternative means of reducing the rabbit population that would involve no threat to the bilby.
Plz discuss each answer choice.
To weaken, we first need to find the conclusion.
Conclusion: The plan may serve the interests of agriculture but will clearly increase the threat to native wildlife.
Notice here that the author says 'may serve the interests' so he is not very particular about the plan serving the interests of agriculture. But he says that it will 'clearly increase the threat to wildlife'. If we want to weaken the conclusion, we should try to weaken 'will clearly increase the threat to wildlife'.
We need to prove that the plan 'may not increase' the threat.
Notice that none of the options other than (C) are relevant. (A) talks about comparison between domestic and wildlife. (B) and (D) don't talk about wildlife. (E) says there is no other way which is irrelevant.
(C) says that rabbits are endangering bilbies (by reducing their food). The plan will reduce the rabbit population which will be good for the bilbies. It might infect bilbies too which will be bad for the bilbies. We don't know what the overall effect will be. Hence, we can say that the plan 'may not increase the threat or it may'. We have cast a shade of doubt on the conclusion which was 'the plan will clearly increase the threat to wildlife'. This is what we set out to do.
Conclusion: The government’s plan, therefore, may serve the interests of agriculture but will clearly increase the threat to native wildlife.
bilby, an endangered native marsupial == animal
native wildlife.== animal
B. There are no species of animals on the island that prey on the rabbits. (B. There are no species of animals ( wildlife or bilbies) on the island that prey on the rabbits( killed due to virus).)
There are no animals on island no animal (including marsupial and wild animal) would feed on rabbits that were killed by virus. Hence no danger of spreading virus to any animal (including native wildlife)
So clearly weaken the threat to native wildlife
C. Overgrazing by rabbits endangers many of the plants on which bilbies feed.
>> the discussion started: Overgrazing by the enormous population of rabbits now menaces the island’s agriculture. Because rabbits maybe eating lot of these plants anyways.
Moreoever conclusion is about threat to native wildlife. But this options talks about bilbies.
Please help to reach at correct answer considering above lines of thoughts.
VeritasKarishma