Monster Hunter all day. There's already an established userbase for it on Nintendo platforms, it's big in Japan and on the verge of breaking out in the west, the devs behind it are some of the few competent ones left at Capcom and it covers a genre and style of gameplay that Nintendo doesn't do while still feeling like a Nintendo-type game. Metal Gear Solid is worthless without Kojima and the Final Fantasy brand in general has lost a lot of its name value after catering their games towards Japanese fangirls.

I think number two is least worse option. I mean Kojima without Metal Gear is nothing, but it doesn't work the other way around.

Option D. Build better hardware that can get all 3 franchises.

Monster Hunter

MGS is losing a lot of interest without Kojima

1st I was Bill games, and now I am Mr. Kimishima. I'm having an identity crisis.

(Monster Hunter def. FF13, really? Are you crazy?!)

Freaking Arzest? With no supervision? Why, man!?

These are all pretty raw deals, but I'd have to go with FFXIII. Final Fantasy is at least a very popular IP which has some history on Nintendo systems. The XIII name is a bit of a drawback, but I would have the option to toss my finest developers at it, and freedom to mess with the formula as I please.

Metal Gear Solid. I'd take it over and give it to one of Nintendo's good dev studios. Konami is going to fuck it up otherwise.

Edit: nvm

Option 2. It's really the only option that won't result in the death of the franchise in question.

Monster Hunter easily, MGS is nothing without Kojima, and FFXIII... really? gross.