paddle_sweep wrote:What's the source of this question please?
I am not sure if 'C' is the most appropriate answer and also the argument is not so clear. Does it say the purpose of the drive is to prevent smoking or is it to prevent smoking on the school premises?
So, need an expect to provide an explanation of the question and the answer.
Cheers
The argument is:
A system-wide county school anti-smoking education program was instituted last year. The program was clearly a success. Last year, the incidence of students smoking on school premises decreased by over 70 percent.
The author thinks that the anti-smoking program was a success because smoking on school grounds decreased. (Because the purpose of the program is to decrease smoking, we have to interpret "success" as: the kids are smoking less--doesn't matter where--just that they are smoking less).
We can say that choice B weakens because the kids who stopped smoking at school continued smoking elsewhere. We can also say that choice B doesn't weaken because the argument was about instances of smoking and not fraction of kids who smoke--in other words, the program may be regarded as successful if kids who used to smoke 20 cigarettes a day now only smoke 2.
We can say choice C weakens because it point to an alternative explanation: the kids' smoking at school decreased not because the kids' smoking decreased but rather because when they want to smoke they just leave the school. Because choice C isn't as ambiguous as choice B, we should select choice C.
We can say that this isn't a great question! (Choice B leads to multiple reasonable interpretations).
Kaplan Teacher in Toronto