You need to enable Office Telemetry logging

You are the Office 365 administrator for your company. The company’s environment includes only
Office 2013 and Windows 8.
Users are not allowed to install applications on client computers.

You need to enable Office Telemetry logging.
What should you do?

A.
In Group Policy, enable logging in the User Configuration\Administrative Templates\Microsoft
Office 2013\Telemetry Dashboard node.

B.
Create a .reg file that sets the registry values under the
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\OSM key to enable the Telemetry
Agent to collect and upload data. Run the .reg file with standard privileges.

C.
In Group Policy, enable logging in the User Configuration\Administrative Templates\Microsoft
Office 2013\Telemetry logging node.

D.
Create a .reg file that sets the registry values under the
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\15.0 key to enable Telemetry Agent to collect
and upload data. Run the .reg file with standard privileges.

Explanation:
The Telemetry Agent must be enabled using Group Policy or the registry. For production
environments that contain hundreds or thousands of client computers, you can use Group Policy
administrative templates.
You can use Group Policy to enable and configure Telemetry Agents. Download the Group Policy
admininstrative template files from the Microsoft Download Center. The policy settings are available
in the path User Configuration\Administrative Templates\Microsoft Office 2013\Telemetry
Dashboard.
Incorrect:
Not C: Incorrect Group Policy Node.
Not D: Incorrect Registry key.
Not B: This would work, but it would require too much administrative effort. For production
environments that contain hundreds or thousands of client computers, you should use Group Policy
administrative templates.
Note: Use the registry to enable and configure Telemetry Agent
The easiest way to update the registry on a single client is to run a .reg file that sets the registry
values that enable Telemetry Agent to collect and upload data.
Telemetry Agent registry settings are located under HKEY_CURRENT_USER\Software\
Policies\Microsoft\Office\15.0\OSM key.

Deploy Telemetry Dashboard
https://technet.microsoft.com/en-us/library/f69cde72-689d-421f-99b8-c51676c77717#configure