Which statement best reflects the collaborative nature of agile business analysis?

C is the most appropriate choice as it underscores the essence of agile business analysis, which thrives on collaboration and communication among teams. In an agile environment, working closely with cross-functional teams is essential for understanding needs, addressing issues, and iterating on solutions. This emphasis on communication ensures that all team members are aligned, share knowledge, and work collectively toward shared goals, fostering a dynamic environment where insights and feedback are actively exchanged.

While the other options may describe aspects of business analysis or different methodologies, they do not capture the collaborative spirit inherent in agile practices. The hierarchical structure mentioned in the first option suggests a more traditional, top-down approach which is contrary to agile's flat, team-oriented design. The reliance on individual expertise implies that solutions are generated in isolation rather than collaboratively, which is not aligned with agile principles that favor collective skillsets and perspectives. Lastly, while speed of delivery is important in agile, it is the collaboration and communication among team members that ultimately drive effective and timely deliveries.