You need to ensure that the settings in the GPO are not processed by user accounts or computer accounts in the Finance organizational unit (OU)

Your network contains an Active Directory domain. The domain is configured as shown in
the exhibit.

You have a Group Policy Object (GPO) linked to the domain.
You need to ensure that the settings in the GPO are not processed by user accounts or
computer accounts in the Finance organizational unit (OU). You must achieve this goal by
using the minimum amount of administrative effort.
What should you do?

A.
Modify the Group Policy permissions.

B.
Configure WMI filtering.

C.
Enable block inheritance.

D.
Enable loopback processing in replace mode.

E.
Configure the link order.

F.
Configure Group Policy Preferences.

G.
Link the GPO to the Human Resources OU.

H.
Configure Restricted Groups.

I.
Enable loopback processing in merge mode.

J.
Link the GPO to the Finance OU.

Explanation:
http://technet.microsoft.com/en-us/library/cc731076.aspx
Block Inheritance
You can block inheritance for a domain or organizational unit. Blocking inheritance prevents
Group Policy objects (GPOs) that are linked to higher sites, domains, or organizational units
from being automatically inherited by the child-level.