Absolutely. In order for something to be true, it has to be possible, and we know from the statements that all As are Cs. Imagine negating the conclusion--"It is not possible that all As are Cs." That can't be right.
However, this is pretty far afield from the GMAT. Does this relate to some trouble you've been having with the test?
Dmitry Farber | Manhattan GMAT Instructor | New York
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