A project within a program has known high-level requirements, but priorities for some requirements are uncertain because they depend on other program projects. How should the project manager prepare for the next steps?

The project manager should prioritize and estimate milestones for the known high-level requirements using historical data. This proactive approach allows the project to move forward with planning for its defined scope, even while some uncertainties related to other program projects remain. Waiting for other projects (option B) would cause unnecessary delays. Escalating to extend the timeline (option A) is premature; the project manager should first attempt to plan based on available information. Asking the PMO to estimate tasks for all projects (option D) is outside the project manager's direct responsibility and would likely be inefficient and impractical for the PMO. The project manager's role is to manage their project effectively with the information at hand.