The vast majority of LR questions turn on your ability to see the gap between premise and conclusion. If you can understand why the premise is good or bad support for the conclusion, the question type becomes trivial and the answer choices fall into your lap. Evaluating an LR stimulus is similar to LG -- do the work up front and you will be rewarded. This post will discuss a way of thinking about arguments that may help you to better evaluate them.
The idea is pretty simple. First, identify the premise and conclusion. Then ask yourself : Just because premise... does conclusion HAVE to be true?
Example: It is a very sunny day outside. JT's ice cream shoppe will be busy.
Just because it is sunny out, does JT's ice cream HAVE to be busy?
Well probably not...
What if JT's ice cream sells god awful product?
What if JT's is in the middle of a desert and no customers are even close to it?
What if it is sooo sunny out that people are too hot to leave their homes?
This test helps to expose why the premise isn't really great support for the conclusion. This is the first step in LR success. If you can consciously figure out why an argument isn't great, you take active control of the question. This makes you less vulnerable to traps and more likely to pick the credited AC.
It sounds trivial, but LR is as simple as thinking about why premises do or do not support conclusions. The difficulty lies in slowing down, understanding what the words are really saying, and putting the gap in your own terms. Hopefully the "Just Because" framework can help make this easier!