What are the three main events in each sprint cycle of the development process?

In the context of Agile development and the specific focus on sprint cycles, the correct choice highlights the essential phases that take place as part of the development process. The phases of elaborating requirements, building the user interface (UI), and testing design are integral components of each sprint.

Elaborating requirements ensures that the team has a clear understanding of what needs to be built and how it aligns with user needs or business objectives. This step is crucial for setting the foundation for the subsequent work in the sprint.

Building the UI involves taking those clarified requirements and transforming them into actual, tangible components of the application. This is where design and development come together to create the user interface that users will interact with.

Testing design is essential in confirming that the developed UI meets the defined requirements and functions as intended. This step helps catch any errors or discrepancies early in the development cycle, ensuring a higher quality product upon completion of the sprint.

While other options include noteworthy activities related to development cycles, they do not encapsulate the primary focus of an Agile sprint in the same comprehensive manner as the elaboration of requirements, UI building, and design testing do. This focus emphasizes the iterative nature of Agile development, prioritizing collaboration, feedback, and refinement within each sprint.