I'm also pondering this. Mikey posted this on another post w/ this question and I found it helpful.

there's also a 7sage podcast on the topic that made me feel better. 🤞 just trying to trust the process and stay patient. Easier said than done!

I prefer written explanations because it's easier for me to hone in on my exact weak area. It's faster. If I still feel shaky on it I'll watch the video.

Oh man, I enthusiastically eliminated D because it is an SA. Now I'm seeing it's also an assumption the argument depends on. I guess I didn't realize it could be both!

I failed to realized that the young generation will remain members of the same generation their whole life. -_- Thus tragically misinterpreting A. The young generation does not become the old generation, they stay Gen Alpha forever! Similarly misinterpreted E, thinking that an age group will get older in the future. Eek! How can I avoid this type of error? Possibly trying to visualize/translate the text a bit more concretely-- inputting my own example like '18-25' for age group, or 'millennials' for generation.

I got this wrong for the same reason: I thought E was making an unreasonable assumption. Looking back and reassessing the flaw, I'm seeing that the author says there's group A of authors who don't need a grammar book, and group B of authors who also don't need a grammar book. The conclusion however applies to all authors. The premises only cover groups A and B, and there could reasonably be more authors that don't fit into those groups. AC E gives an example of one of those secret third categories.

Another way to think of it:

If the author had said:

Some authors don't need a grammar book for reason A. All other authors don't need a grammar book for reason B.

Then, E would be out of the scope of the question. But the not-concrete language of the premises ("any author who..."), allows E to be plausible (and it is the flaw).

I've been using the wrong answer journal template in the 7Sage notes section. It's convenient to just click on the note icon right from the question I'm working on. However, I'm finding going back to read my wrong answer journal notes a little difficult, so I'm considering switching to a spreadsheet that will be more flexible and easy to use for review.