For Northern Trail Outfitters to ensure that only products available in a customer’s closest physical store are shown:

Option B is effective because it organizes inventory by store-specific categories, which can then be dynamically linked to a customer’s location via their postal/zip code. This allows the system to filter search results based on the relevant category that corresponds to the closest store.

Option D leverages separate pricebooks that are specific to each store, enabling product availability to be managed through price refinements. This method also uses the customer's zip code to activate the appropriate pricebook, ensuring that only products priced (and thus available) in the nearest store are displayed.

Both methods are scalable and integrate seamlessly with the existing infrastructure of the Salesforce B2C Commerce platform.