Final answer:
Gatsby must face the reality that Daisy will never love him as he loves her, revealing unrequited love and the harshness of societal expectations.
Step-by-step explanation:
The reality that Gatsby must face when he finally starts hanging out with Daisy is D) that she will never love him as he loves her. Despite Gatsby's deep affection and his idealization of Daisy, their reunion reveals that the intensity of his feelings is not wholly reciprocated. Moreover, the complexities of their respective lives, especially Daisy's marriage, further complicate the possibility of rekindling their past relationship. In F. Scott Fitzgerald's narrative, Gatsby's pursuit of a romantic dream contrasts sharply with the sobering truths of societal expectations and individual choices, leading to a poignant understanding of unrequited love and missed opportunities.