Explanation
Prioritizing requirements is a process of determining the relative importance and urgency of the requirements based on the criteria and preferences of the stakeholders. Prioritizing requirements can help to allocate resources, manage scope, and resolve conflicts. One of the factors that can affect the prioritization of requirements is the dependency, which means that one requirement must be implemented before another requirement can be implemented. In this case, you are correct to move one of the requirements higher in the prioritization because it is needed to be implemented before some of the more important requirements are done. This way, you can ensure that the dependency is satisfied and that the project can deliver the expected value. Ralph is incorrect to rank the requirements based on their level of difficulty, as this is not a relevant criterion for prioritization. The level of difficulty can be considered in the estimation and planning of the project, but not in the prioritization of the requirements. References: BABOK Guide v3, page 52; CBAP / CCBA Certified Business Analysis Study Guide, page 160.