Definition: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Input: [header] How to fix a white screen on an ipod [title] Let your device turn itself off. [step] This means you shouldn't be seeing the apple logo on the screen, rather it should just be black. If you must, wait until the screen turns off. <sep> (A) [title] Power on your ipod when asked, " should i turn it off? [step] " you can pull out the power button, or leave it unlocked. [title] Swipe the screen to the left or right if it's hanging. (B) This will prevent you from using the menu or trying to push the settings switch. To do this : [substeps] Turn off the ringer. (C) This is usually 6:00am to earlier pm, not 6:00pm to 9:30 pm, and you want to take it to ensure it has been turned off. It won't shut itself off until then. (D) [substeps] If your device won't turn off, let the battery run dead. This may take a few hours, but if your phone is no longer responding to button use and won't turn off, it is the best option.
Output:
D