A small number of the contributors to any field typically produce a disproportionately large share of its accomplishments despite the fact that their less productive professional colleagues are fairly comparable in raw ability. This best illustrates the importance of:

Achievement motivation

Explanation: What are the characteristics of achievement motivation?

High-achievement motivation is that motivation which drives individuals to seek high level of achievements consistently and they are always seeking way to master hight standards skills. These are individuals who are highly driven irrespective of their number they will drive themselves to high level of success because they are very competitive, persistent and hard working . High achievement motivation tend to push against all odds to make sure they obtain the goal they have set.

i would say b probably