How should the Salesforce Administrator accomplish this?

The Salesforce Administrator at Universal Containers (UC) has set up topics. UC 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 . Mark old topics as Inactive and assign articles to the new active topics.
B . Merge similar topics in Content Management.
C . Delete existing topics and assign articles to newly created topics.
D . Keep existing topics and reassign articles to newly created topics.

Answer: B