I think that this question in particular is confusing because the conclusion in the question is: A-some-C, but in the explanation the conclusion is stated to be
X-some-C. So they don't match, and I can't use this example to learn how to supply the missing premise because I am unsure whether or not the explanation/answer is correct.
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In the explanation, there are three conclusions shown. This is there just to show you what conclusions can be drawn given the premeses. You'll note that the last of the three is "A -some- X - > C" which is the same as "A -some- C" from the stimulus
