I was going to say D, as it would have no practical use in the game, but then I saw that WaterDumple posted... C. Probably wouldn't be much for utility, but as an aesthetic it would be nice and give a better sense of scale.
And I realize that he's right, so I say C, just so people can really feel what it's like to be an inch tall.
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Warmonger222 posted... Pikmin 2. (I'm not sure if its in the first game or not but its in the second, I see no reason to not put it in this one)
If you mean by holding down R until the camera follows behind Olimar, then that was in both games. Even though that does give an idea of the scale of things with said angle, it's not quite first person enough.
I'll go "C" on this one. Heck, it'd be even funnier if there was a crosshair which you can throw Pikmin with while in FP. :P