What should always guide the Product Owner when ordering the Product Backlog?

The correct choice emphasizes that the Product Owner's primary responsibility is to maximize the value delivered by the Scrum Team, which is achieved through the effective ordering of the Product Backlog. This involves prioritizing items based on their potential value to the stakeholders, market needs, and the overall goals of the project.

By focusing on optimizing value and achieving goals, the Product Owner ensures that the team is always working on the most important tasks that align with the strategic objectives of the organization. This prioritization should be driven by a clear understanding of customer needs, market trends, and business outcomes rather than personal biases, team opinions, or past experiences alone.

Using value optimization as a guiding principle helps ensure that the Scrum Team delivers features and improvements that will have the most significant impact, making the development process efficient and effective in meeting the needs of stakeholders.