Final answer:
Watching an exciting basketball game may increase Mary's snack food consumption due to emotional arousal and social influences.
Step-by-step explanation:
When watching an exciting basketball game, Mary eats more snack food. This is a common occurrence as emotions and excitement can trigger a physiological response in our bodies that increases our desire for food. Emotions like excitement release stress hormones such as cortisol, which can affect our appetite and make us crave snacks. Additionally, the act of watching the game and seeing others eat snacks can also influence Mary's eating behavior through social cues and reinforcement.