I got rid of the bottom two pretty much instantly but I still don't see what's wrong with A. B's definitely more thorough because of what @eliasm said, but test data is a valid computer assisted audit technique, right? What am I overlooking?
EDIT: Alright, googled it. Google says “Answer (a) is incorrect because while test data will indicate whether the client's program ALLOWS credit limits to be exceeded, it will not indicate whether credit limits ARE ACTUALLY BEING EXCEEDED” I sort of figured we could use that information to say “The internal control is reliable, so they probably aren't being exceeded” or “The internal control is bad, so they probably are being exceeded,” but I guess it's just not quite as accurate.
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