the Product Owner is responsible for refining the Product Backlog, which is an ongoing activity that can occur at any time, including between Sprints.The other options are not typical activities for the Product Owner between Sprints, as the next Sprint starts immediately after the current Sprint1, the project plan is replaced by the Product Backlog2, and the Quality Assurance is done by the Developers of the Scrum Team within the Sprint1.
1:The Scrum Guide | Scrum.org2:What is a Product Backlog? | Scrum.org
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