Where can you find information about an assembly's constraints?

The correct choice is indeed the Constraint Navigator, as it provides a dedicated interface within Siemens NX to view and manage the constraints that govern the relationships between components in an assembly. This tool allows users to see all the constraint types applied to different parts, including mates, alignments, and other relationships.

With the Constraint Navigator, users can easily troubleshoot assembly issues by visualizing how constraints are interacting, making it easier to identify any potentially conflicting or unnecessary constraints that may affect the assembly's behavior.

In contrast, while the Part Navigator allows navigation through components in the assembly, it does not specifically focus on constraints. The reuse library includes parts or assemblies that can be used in various designs but does not detail their constraints. The assembly Constraint dialog is useful for setting or modifying constraints but does not provide an organized overview like the Constraint Navigator does. Therefore, the Constraint Navigator is the most appropriate resource for accessing information about an assembly's constraints.