This is something that is not directly on the test, but is incredibly useful for navigating question stimulus quickly and efficiently, not getting confused by complex language in answer choices, and improving your time.

I'm incredibly glad I came back to this.

A is actually pretty clear to me, I think the explanation only served to make it more confusing haha. The final sentence gives you what you need to know. Vacuum tubes aren't currently comparable to semi conductors. They fail the necessary condition and are thus not preferable. Open and shut case.

Also, I think "small experimental" is just describing the qualities of vacuum tubes, and "vacuum tubes/SEVT" and as written in the stimulus and answer choices are all talking about the same thing.

MSS and MBT Questions with these complex sets of conditional rules are the death of me. I simply cannot compartmentalize them quickly enough for the test. So frustrating.

Yes, when you go in to take the official LSAT, you end up taking the test on essentially what looks exactly like the lawhub website, so the test is formatted exactly the same way the practice tests on lawhub are.