Story point estimation in agile is acollaborative team activity, and consensus is critical. Techniques like Planning Pokerare designed to reveal differences in understanding. According to thePMI Agile Practice Guide (Section 5.2 Estimating Techniques)andMike Griffiths (Chapter 6: Adaptive Planning), when there's adiscrepancy in estimates, it is essential todiscuss and understand the rationalebehind differing views.
* Option Cis correct: the team shoulddiscuss and clarifyto reach a shared understanding.
* Option Aignores potential misunderstandings.
* Option Bunnecessarily delays estimation.
* Option Dis incorrect-the team, not the customer, estimates the effort.

The correct answer is B - Evaluate the impact of the change request and let the team and Product Owner decide and reprioritize based on value. Agile allows for mid-iteration changes only in exceptional cases where business value is at risk. Such changes must be evaluated collaboratively.
From the PMI Agile Practice Guide:
"Agile teams may allow scope changes mid-iteration if the benefit clearly outweighs the cost. In such cases, the Product Owner and team collaboratively assess and decide whether to accommodate the change." (PMI Agile Practice Guide, Section 5.2 - Iteration Planning and Scope Flexibility) Mike Griffiths also explains:
"While mid-iteration changes are discouraged, if the change is critical to business value, the team and Product Owner may replan collaboratively. Agile encourages flexibility with customer-focused decision-making." (Mike Griffiths, PMI-ACP Exam Prep, Chapter 3 - Value-Driven Delivery) Incorrect options:
* A and D bypass collaborative evaluation.
* C is too extreme for a small but valuable change.