Tbh I'm not completely sure, but I think his overall message can be summarised to be saying that large republics are better (A). I think so because even though the 4th para starts off by saying it shouldn't be too big in order to avoid confusion, it ends by saying that the former (i.e. a large republic) will be a better option because it increases the probability of a "fit choice".
I think the 5th para elaborates on this (???) because it's all like, 'yeah, more people can vote for the same person so this dude must be in the right' compared to a smaller republic where (paraphrased) literally a hobo can run for president and win. I think he's saying that in a larger republic it's easier to identify the true good men.
So yeah, I don't know if I'm right but I think it's A.
