According to the expectancy theory, is a person’s perception about the extent to which performance at a certain level results in the attainment of outcome.

The answer is instrumentality.

Explanation:

Instrumentality is the belief that a person will get a better outcome depending on how well they perform. The rewards might include money, a promotion or recognition.

If the reward is the same for all performances, instrumentality will be low. A common task based on instrumentality is using commisions, whose reward is based on the amount of services or products sold.

well considering i can't see the graph, it's probably prices

it is a better alternative