Lol, interesting pick. I would go with The Invisible Woman though considering (according to the comic creators) she is arguably the most powerful out of the four. She could turn herself invisible and then create a force field inside their bodies and expand it until they explode! Go Susan! :)

I was thinking suffocation, but exploding works too.

LOL! crazy, but i agree with both of those ideas :)
Or should could make force fields around their eyes and pull so theyd be blind ...

You know, now that I think about, Invisible Woman wouldn't be able to make Mr. Fantastic explode, b/c his body would just expand.

Yeah, until it exploded. He can't expand forever lol.

hmm...yeah, that's true.

Sue could also wait for johnny to create huge blast of super hot fire and collect it in a force bubble and trap Reed inside it. She could blow the thing up as his body is rock even his heart so put a force field in his heart and expand it until it expands till explosion. And put a small force field around Johnny's head to suffocate him and take away all the oxygen away from him without oxygen no fire.

i guess ur right but the thing could take out johnny when sue is distacted whith reed the thing would launch a suprise attack on both

Wow interesting discussion in all these comments! =D But I think @xigbaraxel has a point. They are fighting each other, not one on one. So while Sue is killing one of them the other two could kill each other and then get her.

The torch is the coolest! He coud wipe everyone out fast.