As for your question - A is the only one that makes mostly sense (despite the crude brexit remark). C is a stupid old thing that needs to be sent to the dustbin of history.
That's why I used Brexit as only 1 example of poll failure. There have been a lot recently (Colombia, Austria etc.)
I mean, you shouldn't have used it as an example even if it was one example, because it's a bad example.
Obviously Option A. (sane person option)
C'mon - with about 1/3rd of the electorate participating in early voting / absentee this year, we will know who won within the next few weeks. This race won't be decided on election day.
I think that wrongly assumes that early voters can be assumed representative of all voters, or that there aren't enough voters on Election Day to overcome a skew among early voters. I don't think either of those things are the case, at least not to the point where we can confidently say the race is "decided."