When using the Edit Cross Section command, what option opens the internal sketch for editing?

The correct choice for opening the internal sketch for editing when using the Edit Cross Section command is to select the option that allows you to directly interact with the section curves. This option is specifically designed to facilitate modifications to the sketch that defines the cross-section.

When you choose to edit the section curves, you are essentially accessing the underlying geometry that is represented in the cross-sectional view. This enables you to make precise adjustments to the sketch, which is necessary for any alterations or refinements you wish to perform on that section.

Other options do not directly allow for the editing of the internal sketch in the context of cross-section manipulation. For instance, modifying a sketch or updating geometry does not specifically refer to the act of editing section curves within the cross section context. Each of these alternatives serves different functions related to geometry in the software but does not initiate the internal sketch editing process directly related to cross sections.