Demographics and Interests reports require the activation of Advertising Features.
- Cohort Analysis reports
- Real-time reports
- Geo reports
- Demographics and Interests reports
The correct answer is: Demographics and Interests reports
Explanation: To make the Demographics and Interests data available in Analytics, you need to update Analytics to support Advertising Reporting Features and enable the Demographics and Interests reports.
To see data in these reports, you must first enable advertising features in the “Demographics and Interests” reports for each property. Go into the “Admin” tab under “Property“ and select “Property Settings.” Under “Advertising Features,” set “Enable Demographics and Interest Reports” to on.
When you enable Advertising Reporting Features, you allow Analytics to collect additional information from the DoubleClick cookie (web activity) and from Device Advertising IDs (app activity).
Read more here: https://support.google.com/analytics/answer/2819948