Universal Container’s Salesforce admin wants to debug workflow rules? Which of the following tool should he use?

Answer options:

A.Developer Console
B.Salesforce changesets
C.Flows
D.Process Builder

Correct Answer: A 
The developer console is used to debug workflow rules. It allows the user to get more information regarding the workflow rule and the actions related to it. 
Option B is incorrect because Salesforce changesets are related to moving data from sandbox to production. 
Options C and D are incorrect because the flows and process builders are the automation tools like workflow rules but with more enhanced functionalities. 
Reference: 

https://help.salesforce.com/articleView?id=workflow_rules_considerations.htm&type=5