You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a game where a ball drops from the top to the bottom of a window. You plan to create a single animation for the game. You need to ensure that the animation shows the ball bounce. What should you do?（）

• A、 Use the KeySpline property of a SplineDoubleKeyFrame object.
• B、 Use the EasingFunction property of an EasingDoubleKeyFrame object.
• C、 Use the DecelerationRatio and AutoReverse properties of a StoryBoard object.
• D、 Use the DecelerationRatio and AccelerationRatio properties of a StoryBoard object.