Why would C-some-A not be correct. If “some” statements are reversible, then why couldn’t I draw the conclusion by saying C-some-A? I understand there are other factors at play but doesn’t that premise automatically validate the conclusion?
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If you were to add the premise: C-some-A, it would be:
C-some-A combined with X-> C
This would result in:
X -> C -some- A
Which is X-some-A
A useful tip from this drill that you can apply to future questions is this: if two answer choice say the exact same thing, then they are both wrong. Keep in mind only one answer choice can be correct. If c-some-a was correct, then so would a-some-c.
Without considering anything else, you can already focus on the other 3 answer choices.
I hope this helps. Please let me know if you have any other questions