Scrum is founded on empirical process control theory, or empiricism. Empiricism asserts that knowledge comes from experience and making decisions based on what is known. The Sprint Backlog is a forecast by the Development Team about what functionality will be in the next Increment and the work needed to deliver that functionality into a 'Done' Increment. The Development Team modifies the Sprint Backlog throughout the Sprint, and the Sprint Backlog emerges during the Sprint. This emergence occurs as the Development Team works through the plan and learns more about the work needed to achieve the Sprint Goal.
Why C is incorrect:
a) The Dev Team does not commit to finishing all items in the Sprint Backlog. Committing to completing all items would be fixed scope and fixed time leaving no room to adapt. They commit to the Sprint Goal and doing the right thing.
b) It's also incorrect for the PO to focus on completing the entire Sprint Backlog. Finishing everything should not be his main focus. Having a shippable increment that meets the Sprint Goal is more important than trying to finish everything. The advice in option C is equivalent to "Don't worry, they'll get everything done." but because of the complex domain, you cannot guarantee everything will get done.

Allow the Product Owner to decide what to do with the item as he/she is responsible for the flow of value.

The Product Owner is the sole person responsible for maximizing the value of the product through the ordering and management of the Product Backlog. This reduces complexity in communication and understanding who to go to when there are Question:s about the product. The Product Owner may delegate his/her responsibilities but still remains accountable for the outcome of those responsibilities.

This is the best answer because it is consistent with the Scrum Master's accountability to educate and coach the Scrum Team and the organization on the Scrum framework and its principles. By coaching the Product Owner and the Developers on the purpose of Scrum events, the Scrum Master can help them understand that the Daily Scrum is not a status report or a performance review, but a time to inspect and adapt their progress toward the Sprint Goal. By letting them figure out how to deal with this situation, the Scrum Master can also respect and enable their self- organization and collaboration.

Explanation
When multiple Scrum Teams work from the same Product Backlog, they need to collaborate and coordinate their work to deliver a potentially releasable Increment that meets the Definition of Done. This requires minimizing dependencies between Scrum Teams, such as technical, functional, or organizational dependencies. Dependencies can cause delays, rework, waste, and lower quality. Scrum Teams should strive to be cross-functional and autonomous, and use techniques such as feature slicing, dependency mapping, and integration testing to reduce dependencies123. References: 1:
https://www.scrum.org/resources/blog/dependencies-between-scrum-teams 2:
https://www.scrum.org/resources/blog/feature-slicing-how-make-it-work 3:https://www.scrum.org/resources/blo