Any feeling/observation on how CFAI puts together a, b, c to confuse us? Any tips work well to eliminate one or two of them?

Eliminate the one answer that you know is completely incorrect; therefore, you have a 50/50 chance, if you’re not certain of the answer. I don’t know how they arrange their questions–and I’m not sure any other candidate would know that…

In Ethics do the opposite - select the one you thing is completely bull$hit. Contrarian view.

it’s a little known secret that there can only be two “B” answers in a row. so if you’ve got two B’s, the next one has to be A or C.

Interesting if that is indeed true, is it because people tend to guess B?