Which statement about achievement motivation is most correct?

Which statement about achievement motivation is most correct?
 
  a) Achievement motivation is an inner drive which stimulates you to achieve something because of the nature of the activity itself.
  b) Achievement motivation deals only with the present activity and avoids using information from previous performances.
  c) Achievement motivation will make you a better person because you will accomplish more goals in your life.
  d) Achievement motivation creates the ability to persist in reaching for goals that are all but impossible to achieve.