Which option allows an ArcGIS user to perform a spatial join in ArcMap?

The option that enables an ArcGIS user to perform a spatial join in ArcMap is the Spatial Join tool. This tool is specifically designed to combine features from different layers based on their spatial relationship. It allows users to specify how features from one layer relate to features in another layer, which can include finding features that intersect, are within a certain distance, or meet other spatial criteria.

When using the Spatial Join tool, the user can choose various types of joins, such as one-to-one or one-to-many, and can summarize attributes from the joined features. This functionality is crucial for analyses that require the integration of multiple data sources based on their geographic proximity or relational attributes, making the Spatial Join tool a vital component of spatial analysis in ArcGIS.

In contrast, the Clip tool is used to extract a portion of the input features that overlap with a clip feature, the Merge tool is meant for combining multiple datasets into a single output while retaining all the data attributes, and the Buffer tool creates a zone around features to analyze spatial extents but does not perform a joining operation.