Comprehensive and Detailed Significant estimation discrepancies often indicate a lack of clarity. The story may be ambiguous or too broad. In agile practices, the team should ask the product owner to refine the story so it can be better understood and estimated with greater accuracy. A (averaging) is not an agile practice. C may be helpful but not sufficient in real time. D is arbitrary and ignores team consensus. B supports agile practices like backlog refinement. Reference: Agile Practice Guide, Chapter 5 - Estimation and Planning Scrum Guide - User Story Definition and Refinement