Explanation
= The project manager should determine cross-dependencies and plan a spike in the next sprint to investigate the causes of the delay and find possible solutions. A spike is a time-boxed activity that allows the team to explore a complex problem or learn a new skill1. The project manager should also determine the risks and identify a resolution during the retrospective meeting, which is a regular event that enables the team to reflect on their performance and improve their processes2. These actions will help the project manager to address the issues that are affecting the delivery of the user stories and ensure the quality of the product. References: = PMBOK Guide 7th Edition, Chapter 5: Delivery Performance, Section 5.2.3: Plan and Manage Iterations; PMBOK Guide 6th Edition, Chapter 6: Project Schedule Management, Section 6.2.2.5: Agile Release Planning.