momohe

Problem is that city people are concerned with the increase of frequency in seriouscrimes. The word serious is the key here.

Conclusion is that the measure to keep children after 6 pm/ late evening will not help because most crime happens between 3 and 6

We have to prove that measures will be effective. What if the crimes that happen between 3 and 6 are petty and inconsequential? Not serious any more?? measures are effective. Hence B

To me A,C, D are out of scope. E makes an attempt but because E does not tell us whether the teens will stay in school. An assumption needs to be made to weaken the conclusion. Hence B is better。