Which choice is not a factor of 56?

Oh, dude, let me break it down for you. So, 56 is like 2 x 2 x 2 x 7, right? So, any factor of 56 has to be a number that can divide into 56 without leaving a remainder. If you're asking which choice is not a factor of 56, well, it's like if someone asks you to pick between a pineApple and a shoe - obviously, the shoe is not a factor of 56.