The community has clearly shown that they are are either not concerned about the issue or are equally happy with the proposals. The fact that there are no down-votes on the proposals is indicative that no one is against any of them - which would have been my first choice for deciding which one to go for, or a least which one to drop.
Is there a consensus within the moderation team about what you think should be done with these questions? Do you really think that something actually needs to be done?
If there is you could post a second meta question along the lines of:
As there was a tie with the previous scoping question [link], we, the moderator team, have decided that proposal X is the one we think will best serve the community. If you have any objections to this, please either indicate them by answering below or by voting on the the answers to the original question.
Wait a week (or so) and see if the voting has changed. If it has now produced a clear winner go with that, if not go with your preferred solution.
You often find that when presented with a choice people can't make up their minds, but if you say "We're going to do X" they'll suddenly realise they actually prefer "Y".
Note that "Y" may be "do nothing" in this case. Though you have positive votes for all three "do something" options none of the scores is so overwhelming to make it obvious that you have to do something.