That's a really interesting take on this problem, but I think you might have gotten lucky there.
Technically, the original argument doesn't go from ALL to SOME in my interpretation.
Saying "higher apes have the capacity of language" does sound like ALL of them have it (although it's borderline to me)
If I say "humans have the capacity to learn piano", does that mean that EVERY human has the capacity to learn piano? For example, does a human who was born without arms have the capacity to learn piano? Does a human who was born with debilitating neurological problems have the capacity?
I would say they do NOT have the capacity, but it's still fair to say "humans have the capacity to learn piano".
I think you can speak about a species having a capacity for something without really committing yourself to saying that every single actual member of the species has that capacity.
I also don't interpret the second part of the original argument to be a SOME statement.
When it says "some animal has wings but hasn't used them to fly", it's being unspecific, but I still interpreted it as making a SPECIES-related generalization.
I didn't think the author was saying "some animal", as in Harry the Pig has wings. I thought the author was saying "some animal" as in some species of animal, "Pigs have wings, but don't use them to fly".
Technically, neither of us is correct because that wording is ambiguous and could potentially mean either interpretation. But that's why I think describing the argument as an All --> Some switch is not a reliable way of thinking about this one.
It's also just a little too simple in detail. I've never seen a Match the Reasoning argument be as simple as
Prem: All
Conc: Some
We would always need more detail than that, even if it's something as simple as
Prem: All A's are B's.
Conc: Thus, Some B's are A's.
We could dig into your interpretation of the answer choices as well, but I think we're going to encounter the same ambiguity about whether we're speaking in terms of ALL or SOME.
You interpreted in (A) "a species of lion doesn't eat meat" as a SOME statement. I would interpret that as an ALL statement.
They're both right, depending on your perspective.
You could say SOME species of lion doesn't eat meat.
Or you could say ALL lions of this species don't eat meat.
So let's just say
- nice attention to detail in terms of quantifying modifiers
- congratulations on it working for you on this problem (but I think it's just a happy coincidence)
- strive for a more detail rich model of an original argument when you're doing Match the Reasoning because a model as simple as "All --> Some" would never be alone what they intended to test.
Thanks for the post.