Your application uses two threads， named threadOne and threadTwo. You need to modify the code to prevent the execution of threadOne until threadTwo completes execution. What should you do？（）

• A、 Configure threadOne to run at a lower priority.
• B、 Configure threadTwo to run at a higher priority.
• C、 Use a WaitCallback delegate to synchronize the threads.
• D、 Call the Sleep method of threadOne. 
• E、 Call the SpinLock method of threadOne.