You are creating a Windows Forms application by using the .Net Framework 3.5.You create an instance of a Backgroundworker component named backgroundWorker1 to process operations that take a long time.You discover that when the application attempts to report the progress，you receive a System.InvalidOperationException exception when executing  the backgroundWorker1.ReportProgress method.You need to configure the BackgroundWorker component appropriately to prevent the application from generating exceptions.What should yo do？（）

• A、Set the Result property of the DoWorkEventArgs instance to True before you attempt to report the progress.
• B、Set the CancellationPending property of backgroundWorker1 to True before you attempt to report the background process
• C、Set the WorkerReportsProgress property of backgroundWorker1 to True before you attempt to report the background process.
• D、Report the progress of the background process in the backgroundWorker1_ProgressChanged event.