What command would you use to create a ring around a circle in AutoCAD?

Using the "OFFSET" command is the correct choice for creating a ring around a circle in AutoCAD because it allows you to generate concentric circles at a specified distance from the original circle. This involves selecting the circle you want to offset, and then specifying the distance to create a new circle that maintains the same center but is either larger or smaller, effectively creating a ring-like structure.

The other options do not achieve this specific goal of creating a ring around an existing circle as effectively. Drawing another circle with the "CIRCLE" command does not inherently create a ring unless you manually specify its diameter or radius relative to the first circle. While the "FILLET" command can create rounded joins between lines or arcs, it is not suited for creating concentric shapes, and using the "TRIM" command is intended for cutting or shortening existing objects rather than creating new geometric forms like a ring. Thus, the "OFFSET" command is the most straightforward and efficient for this task.