What emotional struggle does Denny frequently face?

Denny frequently grapples with a desire to prove himself throughout "The Art of Racing in the Rain." This longing stems from various challenges he faces, including professional setbacks and personal loss. As a race car driver, Denny strives to showcase his skills and determination in a competitive environment while also dealing with the criticism and doubts from those around him. His journey encapsulates the universal struggle of wanting recognition and validation in one's abilities, particularly in the face of adversity. This desire is a driving force in his character development and motivates many of his actions and decisions.

The other options represent struggles present in the narrative, but they do not encapsulate Denny's primary emotional conflict. For instance, while he may experience moments of fear or doubt related to racing, it is his overarching battle to establish himself and find success that truly defines his emotional journey. Similarly, longing for his childhood and battling depression may be part of his experience, but they are not highlighted as central themes in the same way as his desire to prove himself.