Well, C works better for this particular test because it has unusually many C answers in the multiple choice. Relying only on points from MC questions, you woul

Well, C works better for this particular test because it has unusually many C answers in the multiple choice. Relying only on points from MC questions, you would expect to pass ~12% of these tests for any given choice of answer to guess every time. Now, having a single answer being correct often often enough to pass this mark would happen ~47% of the time, but between the blatant irresponsibility with the standard, the fact that C is the more or less the canonical answer to just guess when you don't (this might be regional or whatever), and the exactness of the cutoff, I wouldn't be surprised if this test were intentionally arranged to make specifically the "pick C" strategy a pass either.