You are creating a Windows Forms application for inventory management by using the .NET Framework 3.5.The application provides a form that allows users to maintain stock balances. The form has the following features：  （1）A dataset named dsStockBalance to store the stock information  （2）A business component named scInventory.   The scInventory component provides a method named Save. You need to ensure that only the modified stock balances of dsStockBalance are passed to the scInventory Save method.   Which code segment should you use？（）

• A、A
• B、B
• C、C
• D、D