Explanation
The Product Owner is one person, not a committee or a team of people. The Product Owner is accountable for maximizing the value of the product resulting from the work of the Scrum Team. The Product Owner is responsible for managing and refining the Product Backlog, collaborating with the stakeholders and the Developers, and ordering the items in a way that best achieves goals and missions.
The Product Owner represents the interests of everyone with a stake in the product and ensures that the Scrum Team works on the right things at the right time.
Having multiple Product Owners for one product would create conflicts, overlaps, gaps, and inefficiencies. It would also make it harder to maintain a clear and consistent product vision, strategy, roadmap, and backlog. Therefore, the Scrum Team can not have multiple Product Owners.
The Product Owner is accountable for ordering the Product Backlog. The Product Backlog is an ordered list of everything that is known to be needed in the product. It is the single source of truth for the Scrum Team and the stakeholders. It contains all the requirements, features, functions, enhancements, fixes, and anything else that can deliver value to the customers and users of the product. The Product Owner orders the items in the Product Backlog based on factors such as value, risk, priority, dependency, feedback, or market conditions.
References:
Scrum Guide: https://www.scrumguides.org/scrum-guide.html
Product Owner: https://www.scrum.org/resources/what-is-a-product-owner
Product Backlog: https://www.scrum.org/resources/what-is-a-product-backlog

The Scrum Guide states that "the Increment is the sum of all the Product Backlog items completed during a Sprint and the value of the increments of all previous Sprints". It also states that "at the end of a Sprint, the new Increment must be 'Done', which means it must be in useable condition and meet the Scrum Team's definition of 'Done'". Therefore, the Scrum Team must deliver a valuable, useful Increment that meets the Definition of Done at the end of a Sprint. The other options are not acceptable, as they do not meet the criteria of being valuable, useful, or done.
Reference:
The Scrum Guide, section 3.4. Increment
Professional Scrum Product Owner I (PSPO I) Learning Path, section 2.1. The Product Owner and the Development Team Professional Scrum Product Owner I (PSPO I) Sample Questions, question 10