A section is a way to group and organize widgets in a story based on a dimension. To create a section, you need to have the following:
A dimension that you want to use as the basis for grouping the widgets. You can choose any dimension from any model in the story.
One or more widgets that you want to display in each section. You can add any type of widget, such as charts, tables, geo maps, etc.
You can create sections in both the Classic Design Experience and the Optimized Design Experience, but the process is slightly different. Therefore, the correct answer is dimension and widget, as they are required to configure a section in a story