Final answer:
The Hierarchy category is the best SmartArt category to use when creating an organizational chart.
Step-by-step explanation:
In order to create an organizational chart, the SmartArt category that works best is the Hierarchy category.
This category provides various layouts that can be used to represent the structure of an organization, such as a traditional hierarchical structure with a top-down approach.
The Hierarchy category allows you to easily add, remove, and rearrange positions and individuals in the chart.