请教一道GWD逻辑

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.

各位兄弟姐妹可否赐教，这道题GWD上的答案是C，可怎么看觉得不像啊，为什么扯到10年前了啊

Press Secretary:  Our critics claim that the President’s recent highway project cancellations demonstrate a vindictive desire to punish legislative districts controlled by opposition parties.  They offer as evidence the fact that 90 percent of the projects canceled were in such districts.  But all of the canceled projects had been identified as wasteful in a report written by respected nonpartisan auditors.  So the President’s choice was clearly motivated by sound budgetary policy, not partisan politics.

Which of the following is an assumption on which the press secretary’s argument depends?       E

1. Canceling highway projects was not the only way for the President to punish legislative districts controlled by opposition parties.

2. The scheduled highway projects identified as wasteful in the report were not mostly projects in districts controlled by the President’s party.

3. The number of projects canceled was a significant proportion of all the highway projects that were to be undertaken by the government in the near future.

4. The highway projects canceled in districts controlled by the President’s party were not generally more expensive than the projects canceled in districts controlled by opposition parties.

5. Reports by nonpartisan auditors are not generally regarded by the opposition parties as a source of objective assessments of government projects.

这道题我也想请问一下，我觉得应该选E啊，可为什么答案给的是B呢！

跪求解释啊！

第一题：监狱人数想关于两个因素：每年关进去的人和罪犯在监狱里呆的时间的长短。题目说，监狱人数增长，但是上庭和定罪的人没有增加，所以被定罪去坐牢的人增加了。这里只涉及到关进去的人，所以要找一个和呆的时间长短的东西来进行削弱或者加强。C的十年前只是一个标志，并非和现在相比较或者相混淆，只是为了说明关进去的人呆的时间长了，正好削弱，他因削弱，不一定是关进去的人每年增加了，可以减少，但是总有人关进去，而且时间长不放出来，所以总的监狱人数增加了就。

第二题：假设题，not+weaken。B去掉not，意思是被认为浪费的取消的工程属于总统帮，而原文意思是通过取消这些报复反对党，所以方向相反，削弱，not+削弱则为必要条件，即假设，所以正确。