A retailer notices that the Account Addresses page is showing the wrong shopper's address.

To identify the issue of an Account Addresses page showing the wrong shopper's address, the developer should start with the Storefront Toolkit (Option A). This tool provides access to real-time diagnostics and debugging capabilities directly on the storefront, allowing developers to inspect controller calls, caching behaviors, and other session-specific data that could contribute to the problem. The Storefront Toolkit is an effective first step for troubleshooting issues that manifest in the storefront environment, as it allows for immediate visibility into the operations of the site as experienced by end-users.