For customizing the Storefront Reference Architecture to meet specific requirements, the following items would require detailed technical documentation:

Option A (One Click checkout process): Implementing a one-click checkout process involves significant customization to streamline the checkout flow, potentially requiring integration with payment providers and modifications to the user session management.

Option C (Log in through a standard OAuth2 social media account): Integrating OAuth2 for social media logins involves handling authentication tokens, user sessions, and potentially syncing user data with the B2C Commerce profiles, all of which require detailed security and integration documentation.

These customizations require careful planning and implementation to ensure they work seamlessly with existing Storefront Reference Architecture components and meet security standards.