What setting must be enabled to view data in demographics and interests reports?

The Question above has multiple questions as follows

a) Content Grouping

b) Advertising features

c) User permissions on the view

d) In-Page Analytics

Answer is b) Advertising feature.

You can enable the demographics and interests reports from the admin or reporting tab. To enable from the admin tab, you should be signed in to your analytics account and then click admin. Go to account and property. In the property column, click on the property settings and then go to advertising features and set the Enable Demographics and Interests Reports on. Click Save