Scrum Guide says: “The Development Team is responsible for all estimates. The Product Owner may influence the Development Team by helping it understand and select trade-offs, but the people who will perform the work make the final estimate.”
It's the development team that sets the estimate, and they don't have to check with the PO first. While both A and E can entail the same thing, I feel like E better describes the actual responsibility of the task.
E. The Development Team, alone.
The Scrum Guide emphasizes that the Development Team is responsible for estimating the work required for Product Backlog Items during Sprint Planning. The Development Team should have the autonomy to estimate the effort required for each item based on their collective understanding and expertise. The other options (A, B, C, and D) do not accurately reflect the responsibility for estimating Product Backlog Items as per the Scrum Guide.
A is correct, "clarifying requirements with the Product Owner" does not mean the dev team has no autonomy. It's the POs responsibility to clarify the business needs, the Dev team has to take this into consideration.
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