<p>Well. except for the grid-ins, we know that there is one answer that appears EXACTLY 20% of the time. It is the CORRECT ANSWER :)</p>
<p>Sorry, could not resist. Fwiw, even if astute observers could come up with a different distribution, one a fool would rely on such crutch on an official test. Never underestimate ETS’ sense of humor. For all we know, they might write a test that does not contain a single C or a single D. Just to mess with us. Well, that should have been … mess with YOU.</p>