HOTSPOT
You need to implement Community sites and eDiscovery centers in Office 365.
In the table below, select the Office 365 plan that you should use for each type of site.
NOTE: Make only one selection in each column.
Answer: 
Explanation:
We choose the simplest plan that meet the requirement.
Office 365 Business Premium supports Intranet site for your teams
Office 365 Business E3 supports eDiscovery center.
https://products.office.com/en-us/business/compare-more-office-365-for-business-plans