Answer:
Expectancy theory
Step-by-step explanation:
Expectancy theory states that when an individual is faced with different choices they will be motivated in a certain way in choosing a particular option based on what they expect to be the result of the choice.
So behaviour is affected by perceived result or consequence of a particular choice.
In the given scenario Joyce works hard and puts in many extra hours, and getting a promotion is most important to Joyce.
So because of her expectations that manager must recognise that:
(1) she is putting in hard work and long hours to obtain a promotion,
(2) what motivates Joyce will change over time (if she does not get the promotion), and
(3) he must clearly show Joyce how to attain the desirable reward.