Which command would allow you to combine multiple line features into a single polygon?

The ability to convert multiple line features into a single polygon is specifically addressed by the Line to Polygon geoprocessing tool. This tool is designed to take linear data, typically represented as line features, and convert those lines into polygon features. When multiple lines form a closed shape or series of connected lines, this tool recognizes that geometry and generates a polygon that encloses the area defined by those lines.

The construction of polygons from lines is a common operation in GIS when you are dealing with data that outlines boundaries, such as administrative areas or land parcels. The lines must form closed loops or delineate a defined area for the tool to work effectively.

Other options, while they may seem relevant, do not serve this specific function. The Merge command on the Editor menu allows you to combine features of the same type, but it does not create new geometry, such as polygons from lines. The Construct Polygons tool is used for drawing individual polygon features rather than transforming linear features directly into polygons. The Buffer command creates buffer zones around features, which is unrelated to converting lines into polygons. Hence, the correct approach for converting multiple line features into a single polygon is precisely what the Line to Polygon geoprocessing tool is designed to accomplish.