When may a Development Team change its engineering practices?

The option stating that a Development Team may change its engineering practices whenever necessary is correct because Scrum encourages teams to be adaptive and responsive to their needs and the landscape of their work. The Development Team is self-organizing and has the authority to make decisions on how to best accomplish their work. This includes modifying or improving engineering practices at any time during the Sprint, as long as such changes enhance their productivity and the quality of the product being developed.

In an Agile environment, flexibility is key, and the focus is on continuous improvement. If a Development Team identifies a need to refine their practices to work more efficiently or effectively, they should feel empowered to do so, reflecting the principles of Agile and the Scrum framework. This aligns with the idea that teams should regularly inspect and adapt their processes to better meet the goals of the Sprint and provide value to the stakeholders.