<p>I’ve read somewhere that “No error” will be correct 15% of the time. Not that that helps, because that’s about the same probability if you guessed randomly…</p>
<p>There aren’t any answer choices that are correct more/less frequently. Just pick a couple of random practice tests and calculate how often answers show up if you really want to know. If you choose nothing but A for the entire test you’ll get about 20% of the questions right - maybe a bit more, maybe a bit less depending on the date you happened to take it. You’re better off actually trying to figure out the correct answer than fuss over answer choice frequency. Definitely don’t change any answers based on something like “well, I have too many Cs” in a row" or “I haven’t picked A in a while.”</p>