Premise-1 Increasing the number of police personnel is almost always a sure-shot way to considerably reduce the crime rate in any city.
Premise-2 Presence of more number of available police personnel at any given time reduces the propensity of a criminal to commit any a crime.
Premise-3 Reasoning along similar lines, the government plans to increase the number of traffic police personnel
Conclusion Increasing traffic police personal will reduce the number of traffic violations committed within the city of Harlburg by a significant amount.
We have to weaken the conclusion based on some information that increasing traffic police personal will not reduce traffic violations
A. Almost all of the thieves in Harlburg are involved in some traffic violations in the past. Out of scope we donot require this information, eliminiate
B. Crimes require an inordinate amount of planning whereas traffic violations could be a result of impulsive behaviour. People can change their behavior, not a good weakener, eiminate
C. It is significantly easier to escape a traffic police man than a regular police man. escaping them is out of scope here too due to premise-2, Eliminate
D. A significant proportion of the traffic violations in Harlburg are committed in remote areas where posting any personnel is not feasible. This looks like a good weakener, as the major crimes are committed in remote areas, traffic police wont be present there and people will commit violations. Keep it
E. The average duration taken to commit a crime is much higher than that to commit a traffic violation. Out of scope, eliminate
D is our answer