How should the Salesforce Administrator accomplish this?

The Salesforce Administrator at Universal Containers has set up Topics. Universal Containers is going through a rebranding phase and wants to simplify Topics, but keep Articles that have been assigned to the Topics.

How should the Salesforce Administrator accomplish this?
A . Delete existing Topics and assign Articles to newly created Topics.
B . Keep existing Topics and reassign Articles to newly created Topics.
C . Merge similar Topics in Content Management.
D . Mark old Topics as Inactive and assign Articles to the new Active Topics.

Answer: C