Predictable flow in agile is achieved byreducing variabilityin story size and complexity. According to the PMI Agile Practice Guide (Section 5.7: Flow-based Agile and Kanban), working withsmall, similarly sized user storiesincreases throughput predictability and improves cycle time.
Mike Griffiths in thePMI-ACP Exam Prep Book (Chapter 6: Value-Driven Delivery)supports breaking large stories into smaller, testable chunks as a way tostabilize delivery and forecasting.
* Option Ais correct:small user storiesreduce variability and support predictable flow.
* Option Bsupports testability but doesn't directly improve flow.
* Option CandDare too broad or conceptual to specifically improve predictability.