Answer:
The appropriate ending for this paragraph is Riding with Juniper always gave Jenna immeasurable satisfaction.
Step-by-step explanation:
The complete paragraph describes the kind of relationship that Juniper and Jenna shared in the past, all of this description is a very positive one, about how they complement each other and how they felt free to be themselves while they were riding their bikes, then the best line to complete the paragraph is one that summarizes the friendship that they had and the importance of ridding into it.