A GIS analyst is trying to do some maintenance and clear up space as it...

In ArcGIS Pro, the Compact tool is designed to optimize the physical storage of file geodatabases by reducing disk space usage while fully preserving the ability to edit the data. Compact reorganizes how data is stored on disk but does not change or lock the data content or schema, allowing continued editing.

Compress is used with enterprise geodatabases (versioned geodatabases) and primarily affects state-tree compression; it’s not applicable to file geodatabases.

Compress File Geodatabase Data is not an ArcGIS Pro tool; this option is invalid in this context.

Compact is the proper tool for file geodatabase maintenance to reduce file size and fragmentation, while fully maintaining editability.

Therefore, the correct answer is C.