Critical Reasoning

It is not known whether bovine spongiform encephalopathy (BSE), a disease of cattle invariably deadly to them, can be transmitted directly from one infected animal to another at all stages of the infection. If it can be, there is now a reservoir of infected cattle incubating the disease. There are no diagnostic tests to identify infected animals before the animals show overt symptoms. Therefore, if such direct transmission occurs, the disease cannot be eradicated by ____

Which one of the following best completes the argument?

(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE

(B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease

(C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread

(D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late

(E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected

IMO A

(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE

it is not known yet the deadly disease can be trasnmitted from one animal to another. SO destroying the animal will not eradicate the disease.

in the argument it is stated that It is not known whether... to another at all stages of the infection

First chose C (coz timer clocked over 2 min)and then realized it is A

A-disease may be present in those who have not shown symptoms so one will never know at once who are all the animals infected with disease
B- treats all the cattle, so possible
C- though we do not know if the cattle,where we think disease is not spread, is actually free of diseas but this action will certainly help as it will remove all the cattle in infected area.
D- all treated, so possible
E- destroyed any infected animal, so all infected animal are dead.

IMO - A

IMO A

IMO A
b,c,d,e all can eradicate the disease.