Final answer:
The command on the Annotate tab to free draw an enclosed area for a detail like earth around a footing is called 'Polygon Fill.' It is used to create and fill custom-shaped polygons.
Step-by-step explanation:
On the Annotate tab, the command used to free draw an enclosed area for a filled detail, such as earth around a footing, is b) Polygon Fill. This tool allows you to create a custom-shaped polygon by specifying the vertex points, which can then be filled with a pattern or solid fill to represent materials like earth in a drawing. It is a feature commonly used in programs such as AutoCAD for creating detailed and specific annotations on engineering or architectural plans.
This command allows you to draw any shape or area you want by hand. For example, if you want to illustrate the earth around a footing, you can use the Freehand Sketch command to draw the shape of the earth.