A product owner has five backlog items near the top and limited time for validation. How should the effort be allocated?

• AEvenly across all five, so each is equally well understood.
• BOn the item the largest stakeholder is most interested in.
• COn whichever assumptions are both most uncertain and most consequential, since evidence about a decision that would not change is effort spent for nothing.
• DOn the item with the largest estimate, since it carries the most cost.