To add a new order comments attribute to the existing SiteGenesis checkout flow and include it as part of the standard order export, the correct steps involve modifying the system objects and controller logic directly associated with order processing: A. Add the new attribute to the "Order" system object. Modify the "COPlaceOrder" controller to add this new attribute to the current session's "Order" object. This approach integrates the new attribute into the existing order data structure, allowing it to be seamlessly included in the standard order export process without the need for additional data handling or storage mechanisms. This method is supported by the Salesforce B2C Commerce documentation on system object extensions and controller modifications for enhancing functionality.