What can be the reason why Universal Containers sales managers are not able to see Shipment records?

Universal Containers (UC) sales managers are complaining that they cannot access their teams’ Shipment records (a custom object). Initially, the admin suggested that this it happening due to misconfigured role hierarchy (Shipment OWD is Private). Alter investigation, they determined the. role hierarchy for these users is correct.

What can be the reason why Universal Containers sales managers are not able to see Shipment records?
A . The Grant Access Using hierarchies option on Shipment Sharing Settings was incorrectly disabled by the Salesforce admin.
B. Role hierarchy Implicit sharing was Incorrectly disabled by the Salesforce adman.
C. Ownership-based sharing rule for Shipment was Incorrectly disabled by the Salesforce admin.
D. Sales managers have only the Read permission on the 5hipment object and should not be able to edit their team records.

Answer: A