This is an irregular occurrance and your committee should have devised a system for voting which they sent out with the options.
I would say they should ask everyone to number the options 1 to 4 , then apportion points in reverse order, a 1 = 4 points, etc, and the option with the most points wins.
But that’s just me. Go back to whoever issued the vote and ask for clarity. This is not covered by strata law.