What type of relationship should the administrator make between Shipments and Account?

Cloud Kicks has a custom object called Shipments. The Company wants to see all the shipment items from an Account page. When an Account is deleted, the shipments should remain.

What type of relationship should the administrator make between Shipments and Account?
A . Shipments should have a lookup to Account.
B . Accounts should have a lookup to Shipments.
C . Shipments should have a master-detail to Accounts.
D . Accounts should have a master-detail to Shipments.

Answer: A