To answer your marquee question:
Sorry. That's not how human nature works. Humans are curious people and if you ask a question, someone's going to answer it, even if you express your sternest displeasure at being responded to in a way don't wish to be responded to.
Sometimes less is best. Depending on a person's mood, they might take your attempts at channeling the responses as you being a control freak or you being petulant (whether you're a petulant control freak or not!) I might just give you a suggestion simply because you abjure me not to!
Since you're really not asking a content question (like "how do I do...") but rather a qualitative question ("how well did I do..."), you might consider making it clear that the best answer will contain the least number of words. "YES" and "NO" and "POSSIBLY" all being one word answers, these would be the top three. If enough people concur that your scenario is plausible, then you'll either get a whole bunch of "yes" answers, or a whole bunch of people will upvote the "yes" answer.
You could also consider a clever flanking manoeuvre by answering your own question three times: YES -- NO -- MAYBE and simply ask people to upvote they one they agree with.
But you really can't prevent people from giving you suggestions. Downvoting them, while perhaps serving your immediate thirst for retribution, is ultimately not the most prudent response. It's also a waste, because commentary responses often earn votes and receive comments. Your displeasure vote will not even be registered with the miscreant.