Which of the following is a use case for extending Flow Builder capabilities via code?

Embedding Lightning Web Components in Flow Builder is a use case that enhances the capabilities and user experience of flows. Lightning Web Components (LWCs) are modern, reusable components built using HTML and JavaScript, and they can significantly improve the interactivity and functionality of flows. By embedding LWCs, developers can create custom user interfaces that capture complex data inputs or present dynamic content tailored to specific user needs. This ability allows for seamless integration of advanced UI elements, making the flow more engaging and efficient for users.

In contrast, the other options focus on fundamental features or processes within Flow Builder itself. Simple data entry and basic decision making are essential functionalities that Flow Builder already supports natively, without the need for code extension. Running single-step processes can be accomplished straightforwardly within Flow Builder's existing capabilities, which means there's generally no need to extend this aspect with code.

Thus, embedding Lightning Web Components stands out as the scenario where extending Flow Builder through code provides added value, enabling developers to enhance user experiences and address more complex requirements that go beyond the basic functionalities of Flow Builder.