关于无关选项的一个疑惑希望大佬解答~~~

SRYMS

lz逻辑一直是最薄弱的，但也经过了大量的练习与总结能分析每一道逻辑题是什么套路，也知道选项大致的方向，但常常卡在比较tricky的无关选项的排除上。lz之前以为无关选项就是对结论没有影响，但有些无关选项做题的时候会觉得明明这个能影响到结论呀~为什么答案上说无关呢？
就好比这道题的E选项，好像是也跟结论有一丢丢相关的，吧，但解释中说是irrelevant...

Congress has passed a law that scales back the tax credits offered to purchasers of hybrid cars. Because of this, the number of hybrid cars sold each year, which has approximately doubled in each of the last five years, is likely to flatten in the next few years.

Which of the following statements, if true, most weakens the conclusion that the number of hybrid cars sold annually is likely to flatten in the next few years?
AMost people buy hybrid cars for reasons other than to save money in the long run. 分析该选项
BRecently published studies have shown that hybrid cars cost significantly more to repair and maintain than do comparable traditional cars. 分析该选项
CGasoline prices are projected to fall over the next few years. 分析该选项
DHybrid vehicles have a reputation for having less power than comparable non-hybrid vehicles. 分析该选项
EManufacturers have significantly increased their budgets for advertisements touting the fuel efficiency of hybrid cars.

然后又经过我自己的一些总结，好像跟讨论对象/限定范围/直接前提无关（除了他因削弱）但对结论有影响的也都属于无关选项？

希望有NN评价一下我的这个“猜测”或者能阐明一下到底何为无关~~~

wammbb2017

题干是说改变税务利好会不利于hybrid car的销售。问的是最weaken这个的选项，那么首先你要做好准备选项里可能是有多余1个有关选项的，但是要选“最”有关的。那么最直观的就是改变税务利好不会影响该车销量，那进一步想为什么会出现这种情况呢？如果买车的人都不在乎省税的这点钱，说明买车不是出于经济原因。那么有讲非经济原因买车的就是正确选项。E选项估计你觉得厂商会加大广告力度然后刺激销量，但是这个跟题干无关呀，题干只讲了两条：税和车的销售额。任何跟着两条无关的都是无关选项。