What can be done to allow community users to see all cases for their account?

Universal Containers (UC) enables customers to manage issues using a Customer Community license. The Case external organization-wide default is set to Private. Currently community users can only see cases they created.

What can be done to allow community users to see all cases for their account?
A . Write an Apex class to create manual shares for these users.
B. Ensure the criteria-based sharing rule applies to all users.
C. Create a sharing set for these customers.
D. Upgrade the licenses to Customer Community Plus.

Answer: C