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Answer: regions
Explanation:
A pivot table is referred to as a table of statistics that is used in summarizing data from an extensive table. Such summary can include averages, sums, etc.
Pivot Table can also be used to sort, and reorganise the data stored which is stored in a table. If there's a data for regions, products, and customers, the option on a pivot table that will be found in the fields is "regions".
The answer is C because idiopathic means a disease that has an unknown cause.