Bad news for your sanity. Almost everyone got yesterday's problem wrong (only the legend @Gia Huy got it right). The answer was B, not C, as C ONLY talks about the experiment, but there is an entire sentence in the passage that has nothing to do with the experiment at the beginning, so you need a more broad choice to cover the entire thing. This is probably harder than SAT-level questions, though, so I don't blame you all for missing it. We'll do an interview with @Jason Parton after the March 14 SAT. We also are going to have to do an interview with the winners of the challenge. Not sure if we should do them altogether. Probably not, but let me know.