If you need to make a duplicate solid body to modify, what command would you use?

The appropriate command to use when you want to create a duplicate solid body for modification is the 'Duplicate Body' command. This command allows you to create an exact copy of the solid body, which can then be independently modified without affecting the original. It is particularly useful when you want to preserve the original design while experimenting with variations in the copied version.

While 'Copy Body' may seem like a viable option, it typically serves a different purpose, often involving duplicated geometry for assembly purposes rather than modifying the properties of the solid body in the same manner as 'Duplicate Body.' The other options, such as 'Extract Geometry - Body' and 'Extract Geometry - Region,' focus on retrieving or referencing geometry rather than duplicating the entire body with all of its features, which is essential when a complete copy is needed for further modifications. Therefore, 'Duplicate Body' is the best choice for this scenario.