From a Customer Success Perspective, Which Reason to Monitor Your

From a Customer Success perspective, which reason to monitor your customer's health is the most important?

A) It provides the opportunity to address any changes in the customer's experience or actions around the solution
B) It allows the customer to identify unused licenses so they can be addressed via a service improvement plan
C) Understanding your customer's health directly enables renewals
D) It gives the customer valuable insight so they can automatically renew critical on time