A proof has been suggested on Quora for "the nth terms of convergence of the Collatz map".
There are two parts to the proof:
A general statement of the theorem, https://qr.ae/pyD8Nk, and an inductive proof of that theorem, https://qr.ae/pKRv1A.
The ambiguity is whether or not proving convergence of the nth terms is the same as proving all sequence Ns converge on 1.
A third, generalized, proof may be published on Quora.
If you want to learn about the conjecture and its place in contemporary mathematics, watch the Veritasium video on YouTube: https://youtu.be/094y1Z2wpJg
About the prize: https://mathprize.net/posts/collatz-conjecture/
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@EvanDaniel "Other" seems to be a default imposed by the website. You can choose a simple yes or no - or one of the three elaborated yesses. And there may be other scenarios I haven't thought about.
@MichaelMRoss
It's probably best to cancel this market and remake it as a multiple-choice independent market, where there can be more than one correct option:

That feature was only added 3 days ago, so you didn't get to select it when you made your market, but now we have it.
@bohaska So that change cannot be made to the existing question? If not, would I be able to make the switch to multiple choice by using the Duplicate command?
@MichaelMRoss Yes, you can duplicate the question, then it'll open a question creation pane. Then, change the number of answers to be chosen to "Any number".
Manifold doesn't support changing types of questions after they're made.