You’re definitely onto something about SA and Principle questions, but it has nothing to do with causality specifically.
In fact, in the example you gave, we would say
the fact that Sarah likes apples CAUSES her to eat an apple every morning (EFFECT).
If we were to make CAUSE sufficient and EFFECT necessary, then this one would look like
Like Apples --> Eat them every morning
But you weren’t wrong about your sufficient assumption.
Sufficient assumption isn’t about cause and effect. It’s about premise and conclusion.
And in your argument the CONC was “Sarah likes apple” and the PREM was “Eats them every morning”.
So you were correct in how you arranged it. But you were correct because the PREM goes on the sufficient side and the CONC goes on the necessary.
The reason (rationale) you’re noticing that answers on SA and Principle are highly predictable is simply because that’s our task!
The question stems are literally asking us,
Which answer choice is a bridge from the premise to the conclusion?
When you’re dealing with arguments that have gaps / missing links, that are vulnerable to objections, there are two different types of LSAT ideas:
- Idea Math (missing links between ideas already mentioned)
- New Objections (bring in ideas that haven’t been mentioned)
Consider this argument:
Bob applied to Harvard. Thus, Bob wants to go to a good school.
Idea Math (connecting the ideas that were mentioned):
1. Harvard is a good school
2. Applying somewhere means you WANT to go there
New Objections (bringing up new ideas that haven’t been considered)
1. What if Bob’s parents forced him to apply?
2. What if he only applied to see if he could get in (for bragging rights)?
3. What if he applied only because his girlfriend is going there, not because he cares about the quality of school
etc.
Idea Math is always finite. There might be only one or two ideas that need to be linked.
New Objections are usually infinite. You can come up with storylines all day (if you’re dealing with Alternate Explanations)
So when you're doing Flaw, Nec Assump, Str, and Weaken, you see a mix of answer choices that are "connect the dots" idea math and a other correct answers that bring up totally new ideas. It's possible to specifically predict idea math answers, but the new ideas ones are fuzzier. You'll think, for example, "I need some OTHER way to interpret that statistic", but not know/care precisely what that is.
But SA and Princ are pretty exclusively Idea Math. So when you're pre-phrasing SA and Princ, you're just designing an If/Then that takes you from Prem to Conc.
And if you're doing it right, you usually can predict the correct answer.
