[Dragontongue195040]

I'd say that the most interesting and potentive one on the list would be 1MTO.
here's why 1MTO would work the best:
First off, I have to say, though you might not admit it but many battlers are biased towards singular typings. When we see 'ice' type, no matter what tier you play, most of you automatically think 'semi fast frail sweepers'. And, to the most extent, that is true. Ice types don't do very well defensively. In fact, this is proved by the very fact that many of you are posting your opinions based off of what the game has showed you- specially defensive normal types, frail psychic types, and augmented bug types. I say we turn those ideas upside down. Let's have fast, frail normal types. Let's have slow, defensive dragon types. I'll even go as far to say that frail steel types would even be interesting (Lucario, etc. Etc.) It would be much more interesting to see a pokemon that is waay out of it's comfort zone typing wise than to see another pink, normal type blob that everyone has to bitch about. The reason why mono typing does this better than dual typing is because in dual typing the types affiliate with each other. Let's say that you get an ice/steel type, and it works great. But we'd never know whether it was because the steel type made the fast frail ice type more defensive, or whether it was because the Ice type made the steel type more offensive.
I hope I'm not losing you guys, so here are my ideas in a easier to read format:
1MTO
~single typing easier to work with
~the conclusion will be nice and clear- no mix ups between effectiveness of types
~can TOTALLY bend the stereotypes that are packaged with many types (imagine blissey with thick arms)
~we can focus all of our attention to one type
~we can possibly even popularize certain typings such as poison or normal

as you can see, the possibilities are endless. Sure, options B and C work, but not as well as A.