The narrative detail of Mariah trying roller skating with Jordyn's help, despite fear of failure, best supports character development and themes of courage and friendship.
The detail from the narrative that best supports the analysis would likely be the one that shows a character overcoming a challenge or exhibiting growth.
For example, Mariah trying out roller skating with Jordyn's help, despite her worries about failing, could support an analysis focused on character development, courage, and overcoming fears.
The detail demonstrates Mariah's willingness to step out of her comfort zone and the support she receives from Jordyn, both of which are thematic elements pointing towards the narrative's exploration of friendship and personal growth.