C:
The reason why there are many duplicate Account records and numerous sharing rules created in Salesforce is that the Organization-Wide Default for the Account object is Private4. This means that users can only see their own accounts and those shared with them explicitly by sharing rules or other means. This could lead to users creating duplicate accounts without knowing that they already exist in Salesforce. If the Organization-Wide Default for the Account object is Public Read/Write or Public Read Only, users would be able to see all accounts in Salesforce and avoid creating duplicates. The Object permissions for the Account object are not relevant for this question.