Final answer:
Staging in the context of the business strategy diamond primarily relates to resources, as it involves the timing and sequence of strategic actions and how resources are allocated over time.
Step-by-step explanation:
Among the factors relates to staging as part of the business strategy diamond, the most relevant would be resources. Staging refers to the sequence of actions and the timing aspect within the strategy, which relates directly to how a company allocates its resources over time. It concerns the speed and sequence of moves in executing parts of the strategy. While structure, systems, and skills are also important elements of the business strategy diamond, they do not directly pertain to staging, which is more focused on the timing and progression of strategic steps.