Scrum Team's responsibility.
Explanation:
The best answer is C. Ensure every Increment meets them. Non-functional requirements (NFRs) are system qualities that guide the design of the solution and often serve as constraints across the relevant backlogs1. NFRs are persistent qualities and constraints typically revisited as part of the definition of done (DoD) for each Iteration, PI, or release1. The Scrum Team should ensure that every Increment meets the NFRs, as they are part of the product requirements and affect the value delivery and customer satisfaction.