Final answer:
The most important output of project execution is Work products (B), which are the deliverables of the project execution process. Other options like change requests, stakeholder analysis, and the WBS are important but not the primary outputs of execution.
Step-by-step explanation:
The most important output of project execution is B) Work products. These are the deliverables that result from the project execution process and they are critical to moving the project forward towards its ultimate goal. Work products can include anything from a physical product, service, or result that the project was initiated to produce.
Change requests (A) and stakeholder analysis (C) are important parts of project management as well, but they serve as tools to manage and control the work rather than being the output. The Work Breakdown Structure (WBS) (D) is developed in the planning stages of a project and while fundamental for project planning, it is not an output of project execution.