How can you set a project's units in Revit?

The correct choice focuses on the Project Units dialog, which is the centralized location in Revit for managing how measurements and quantities are displayed throughout the entire project. By navigating to the Manage tab and selecting the Project Units option, users have the ability to customize units for various categories such as length, area, volume, and more. This function allows for all elements within the project to be consistently measured and represented, ensuring clarity and coherence in the project documentation.

Manually entering units in the drawing area does not provide a comprehensive method for setting and applying consistent units across the entire project, while selecting a unit format during the initial project creation only determines the settings for that specific instance and may not be easily adjusted later. Additionally, choosing units from the properties panel of individual elements only modifies the representation of those particular items. Thus, the Project Units dialog stands out as the most efficient and effective method for project-wide unit management in Revit.