Temperature, that's the most important factor
If there are no selections than i would say a thick atmosphere and an unusual large moon.<span />
I would say D. Hope I helped, sorry if I didn't. :)
It depends on what unit/subject you're looking at.
Because in physics, I know that if you are considering Newton's theory of particles, all particles technically go in a straight line from the original direction. BUT, if you're looking at the Wave of the Particle theory, then you would assume that particles do not necessarily follow the above b/c they follow the properties of a wave...