Given that staggeringly difficult choice, I would have to go with 9. See to make the number worth something I figure we have to divide it into 42. If we divide 8 into it we only get 5.25, however if we divide 9 into it we get 4.66666666666666666666666666666666666666666666 etc… etc… a far more devious number when you are trying to divide into the answer to life, the universe and everything