The required information is structured application data that is specific to one site but must move consistently from staging to production. Asite-scoped, replicable Custom Objectis therefore the correct model.
Salesforce custom-object definitions provide two relevant controls.Storage Scopedetermines whether custom- object instances are organization-wide or site-specific, whileData Replicationdetermines whether custom- object data can participate in replication between environments. Salesforce specifically documents that custom objects can be local to a site and that custom object types can be configured as replicable.
The developer can define one object per country with attributes such as country code, price book ID, flag image URL, display name, and ordering information. The storefront can query these records to construct the country selector dynamically.
Option A attempts to overload the Locale system object with business configuration that is not fundamentally locale metadata. Option C stores structured application configuration in content assets, which are primarily merchandising/content entities and would be less suitable for strongly structured programmatic lookup.
Study Guide reference:Data Management Using Business Manager Usage - Custom Objects, site-specific storage scope, data replication, structured application configuration, and multi-country storefront design.