The project manager should invite the product owner to attend daily standup meetings so they can assess progress. This is the best option because it allows the product owner to stay informed and involved in the project without disrupting the team members throughout the day. Daily standup meetings are a common agile practice that provide a brief and focused update on the project status, issues, and plans1. By inviting the product owner to these meetings, the project manager can address their concerns and expectations, as well as foster collaboration and trust between the product owner and the team. This option also aligns with the agile principle of "business people and developers must work together daily throughout the project"2.

The other options are not as effective as option A. Option B is not frequent enough to satisfy the product owner’s need for information and involvement. Option C is not collaborative and may create conflict between the product owner and the project manager. Option D is not appropriate and may damage the relationship between the product owner and the team. References: 1: PMBOK® Guide, 6th edition, page 540 2: Agile Manifesto, [Principles behind the Agile Manifesto]