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

The command that facilitates the creation of a duplicate solid body for modification is known as "Copy Body." This command allows users to create an exact duplicate of an existing solid body within the design environment. When using "Copy Body," the new body can be independently modified without affecting the original, making it ideal for scenarios where different configurations or features are needed based on a similar geometric foundation.

In contrast, the other options serve different purposes. "Extract Geometry - Body" is used primarily to pull specific geometric information from a solid body but does not create a new independent object for further modifications. "Clone Solid" functions similarly to "Copy Body," but it often carries specific implications about maintaining a reference to the original body, which may not allow as much flexibility for independent modifications. "Mirror Body" is employed to create a mirrored version of a body based on a defined plane, which can be useful for symmetry but not for general duplication for modification purposes.

Thus, to create a duplicate that can be freely modified, "Copy Body" is indeed the most suitable command.