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Meenakshi Jain
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Citizens of parktown are worried by the increased frequency

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Citizens of parktown are worried by the increased frequency of serious crimes committed by local teenagers. In response, the city government has instituted a series of measures designed to keep teenagers at home in the late evening. Even if the measures succeed in keeping teenagers at home, however, they are unlikely to affect the problem that concerns citizens, since most crimes committed by local teenagers take place between 3pm and 6pm
Which of the following,if true, most substantially weakens the argument ?
1) Similar measures adopted in other place have failed to reduce the no of teenagers in the late evening
2) Crimes committed by teenagers in afternoon are mostly small thefts and inconsequential vandalism
3) teenagers are much less likely to commit serious crimes when they are at home than when they are not at home
4) Any decrease in the need for police patrols in late evening would not mean that there could be more intensive patrolling in the afternoon
5) The schools in parktown have introduced a number of after school programs that will be available to teenagers until 6pm on weekday afternoons
 

Official Answer

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flamingo
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Premise: The city government has instituted measures to keep teenagers at home in the late evening, but MOST CRIMES committed by teenagers take place between 3pm and 6pm. 
Conclusion: The new measures are unlikely to curb the increase in SERIOUS CRIMES. 
Notice the change in LANGUAGE and SCOPE. 
The premise is about MOST CRIMES, but the conclusion is about SERIOUS CRIMES. 
MOST CRIMES ≠ SERIOUS CRIMES. 
The assumption here is that the CRIMES committed between 3pm and 6pm are SERIOUS. 
To break the link between the premise and the conclusion, the correct answer must show that the CRIMES committed between 3pm and 6pm are NOT SERIOUS. 
Answer choice B does just that: Crimes committed by teenagers in the afternoon are mostly small thefts and inconsequential vandalism. 
The correct answer is B.

answered May 24, 2015 by Guru (5,628 points)
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