gwd一道逻辑题，请求解答

参考答案是C，我怎么觉得D对啊？

Q22:

In each of the past five years, Barraland’s prison population has increased.  Yet, according to official government statistics, for none of those years has there been either an increase in the number of criminal cases brought to trial, or an increase in the rate at which convictions have been obtained.  Clearly, therefore, the percentage of people convicted of crimes who are being given prison sentences is on the increase.

Which of the following, if true, most seriously weakens the argument?

1. In Barraland the range of punishments that can be imposed instead of a prison sentence is wide.
2. Over the last ten years, overcrowding in the prisons of Barraland has essentially been eliminated as a result of an ambitious program of prison construction.
3. Ten years ago, Barraland reformed its criminal justice system, imposing longer minimum sentences for those crimes for which a prison sentence had long been mandatory.
4. Barraland has been supervising convicts on parole more closely in recent years, with the result that parole violations have become significantly less frequent.
5. The number of people in Barraland who feel that crime is on the increase is significantly greater now than it was five years ago.

a.讲惩罚与判刑的关系，与原文无关；

b.将一个改建使监狱没那么挤的问题，与原文无关；

c.讲犯人在监狱待的时间（刑期）的变化，与原文沾边；

d.讲pv这事情，无关；

e.讲人感觉的问题，无关。

谢谢ls,

'我理解的假释less frequent了，监狱里的人就多了，属于他因削弱

当否