Its a matter of ruling out answers. Einstein didn't care what others thought, also he didn't usually publicize his works. And though three sounds good, he was actually usually unmotivated because he felt like there was too much sometime, or too little other.
Answer:Einstein was motivated by the pursuit of knowledge.
Explanation: I just turned it in and got it right with this answer. Also, Einstein showed the ability to learn and self teach complex subjects starting at a young age. Nothing about the man says he was interested in anything but pursuing and growing his own knowledge.
