I would like to add a point here, that all C and A students cannot be the same.
You will find successful A students as well as unsuccessful A students. Same goes for C students.
We are humans, we change and adapt to different situations. The one who adapts better than the other, becomes the boss regardless of how much GPA he/she got.
Humans constantly evolve. This trait of ours is what separates us from lifeless robots.