every individual is continually exerting himself to find out the most advantageous employment for whatever capital he can command. it is his own advantage, indeed, and not that of the society which he has in view. but the study of his own advantage naturally leads him to prefer that employment which is most advantageous to the society.

read the quotation by adam smith.

according to this quote, what motivates most individuals?
a) desire for power
b) concern for others
c) competition for jobs
d) sense of self-interest