Final answer:
The Product Owner has content authority to make decisions at the user story level in Scrum Agile project management.
Step-by-step explanation:
In the realm of Agile project management, specifically within the Scrum framework, the person who has content authority to make decisions at the user story level is typically the Product Owner. This role has the responsibility to ensure that the development team is working on stories that provide the most value to the customer and the business, aligning with the product vision and goals. The Product Owner maintains the product backlog, which includes prioritizing user stories and determining what gets worked on for upcoming sprints. The Product Owner works closely with both business stakeholders and the development team to make sure that the acceptance criteria of each user story meet the stakeholders' requirements and that the team understands the stories well enough to implement them effectively.