According to the Scrum Guide1, self-organization is one of the essential characteristics of Scrum Teams. Self-organizing teams choose how best to accomplish their work, rather than being directed by others outside the team. Self-organization enables teams to deliver faster and better results by harnessing their creativity and skills. Some benefits of self-organization are:
Increased creativity, as team members have more freedom and autonomy to explore new ideas and solutions.
Increased self-accountability, as team members take ownership and responsibility for their work and outcomes.
Increased commitment, as team members are more engaged and motivated by having a say in how they work.
The other options are not benefits of self-organization, as they may imply external control or pressure.

The Product Owner is responsible for engaging the stakeholders, as stated in the Scrum Guide1: "The Product Owner is one person, not a committee. The Product Owner may represent the desires of a committee in the Product Backlog, but those wanting to change a Product Backlog item's priority must address the Product Owner."

The best two answers are A and C. These two ways of creating Scrum Teams are consistent with Scrum's values because they respect the self-organization and empowerment of the people who will be working in the teams. They also foster openness and courage by allowing the people to express their preferences and opinions about the new structure.
B, D and E are not consistent with Scrum's values because they impose a top-down approach that does not involve the people who will be affected by the change. They also undermine the commitment and focus of the teams by assigning them to work on something they may not be interested in or passionate about.

According to the Scrum Guide1, the Sprint Backlog is the property of the Developers and no one else can tell them which items they should work on. The Developers can select any item from the Product Backlog that they forecast they can complete within a Sprint. The Developers are self-organizing and decide how to turn Product Backlog items into an Increment of value. Therefore, no one owns a Sprint Backlog item, but the entire Development Team is accountable for it.

According to the Scrum Guide, the Product Owner can cancel a Sprint, as he or she is responsible for maximizing the value of the product and the work of the Development Team. The other roles do not have this authority, although they may provide input and suggestions to the Product Owner.