You will be given a definition of a task first, then some input of the task.
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".

[header] How to save files to a usb flash drive [title] Insert the flash drive into a usb port on your computer. [step] Make sure that you don't force the drive into the port; it only goes in one way. [title] Ensure that the flash drive appears on your computer. <sep> (A) [step] If it doesn't, then you have a 5.7 mb drive. [title] Backup important files if you want to place them into storage. (B) [step] Usb flash drives are often referred to as " hd, " as these are the kind of drives that connect objects to the usb ports on almost any computer. [title] Verify that the flash drive has an idle cycle. (C) [step] Most people don't, but you will figure that out, because 3d drives are hard for almost any computer. [substeps] If you're really new, look for the " no drive " label on the drive's backing or stamped firmly on the drive. (D) [step] You'll usually receive a notification that the flash drive has been detected. If these notifications are turned off, you can check to see if it is connected.
Output:
D