Essential to EC is the idea that these three options do not exhaust the possible responses to SA. And, according to proponents of EC, that is a good thing, since they generally hold that skepticism is unacceptable, that the closure principle is extremely plausible, but also that it is hard to see how P1 could be false.[7] But if none of (i)-(iii) make for an attractive response to SA, what is left to deny?