How can UC modify the standard Product object model to support a hierarchical data structure in order to synchronize product data from the source system to Salesforce?

Universal Containers (UC) wants to store product data in Salesforce, but the standard Product object does not support the more complex hierarchical structure which is currently being used in the product master system.

How can UC modify the standard Product object model to support a hierarchical data structure in order to synchronize product data from the source system to Salesforce?
A . Create a custom lookup filed on the standard Product to reference the child record in the hierarchy.
B . Create a custom lookup field on the standard Product to reference the parent record in the hierarchy.
C . Create a custom master-detail field on the standard Product to reference the child record in the hierarchy.
D . Create an Apex trigger to synchronize the Product Family standard picklist field on the Product object.

Answer: B