Research on the experience of flow suggests that people experience the most happiness when they are

A) eating.
B) daydreaming.
C) highly self-aware.
D) absorbed in challenging activities.

Research on flow suggests that people experience the most happiness when they are absorbed in challenging and engaging activities that require focus and skill. This is because when we are in a state of flow, we are fully immersed in what we are doing, and our attention is so focused that we lose track of time and even our sense of self. This state of being fully engaged and challenged helps us to feel a sense of accomplishment and fulfillment, leading to greater happiness.