An agile team completed 9 of 10 sprint stories. At the retrospective, some members said they completed all their stories, but one team member did not finish a story. What should the agile leader do?

The correct answer emphasizes a core agile principle: collective ownership. While individuals are accountable for their tasks, the team shares responsibility for the sprint's success or failure. This approach fosters collaboration and mutual support, preventing a blame culture and encouraging the team to help each other. "Propose assigning stories at sprint start based on individuals' strengths" is incorrect because agile teams typically self-organize and pull stories, rather than having them assigned, and this doesn't address the collective responsibility aspect. "Work with the product owner to remove the story from the sprint because story points are indivisible" is incorrect; while story points are a relative measure, removing a story doesn't solve the underlying team dynamic issue and might hide the problem. "Ask the team to address this during the next sprint planning" is incorrect because the retrospective is precisely the forum for inspecting and adapting team processes and performance.