Although if you want to vote, you have to pick at least one from each grouping.
Question: since there are 27 options up there, could we have 9 per grouping with a 'None of the above option' in each one if we don't have a preference in that group? Or is that too overly complicated?
Of course now I find out that I could've just increased the maximum option setting. Anyway, I executed your suggestion by increasing the maximum options to 11, because I can't move an option to another cluster without losing the votes for that option.
So yeah, you can vote for 'None of the above N (required to continue)' if you don't like any of the options in a cluster.