Rita has just finished a large meal at her favourite restaurant.Although she is quite full,when the waiter brings the dessert tray,she orders a piece of cheesecake.Which theory does NOT explain Rita's behaviour

A)  pull theories 
B)  drive theory 
C)  expectancy-value theory 
D)  incentive theories

Drive theory suggests that our behaviours are motivated by biological needs such as hunger, thirst, or sleep. Since Rita is already full, it is unlikely that hunger or thirst is driving her behaviour. However, pull theories, expectancy-value theory, and incentive theories could all potentially explain why she ordered the cheesecake. Pull theories suggest that external stimuli or cues can attract us to certain behaviours, such as the sight of the dessert tray. Expectancy-value theory considers the individual's beliefs about the likelihood of achieving a goal and the value they place on that goal, and it is possible that Rita believes the cheesecake will be highly rewarding. Incentive theories suggest that the promise of a reward or reinforcement can motivate behaviour, and the prospect of a delicious cheesecake could serve as an incentive for Rita to order it.