Given the task definition and input, reply with output. 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 move your itunes library to an external driver with tuneskit [title] Gather your files. [step] Go to " itunes-] preferences " and make sure the options " keep itunes media folder organized " and " copy files to itunes media folder when adding to library " are checked. [title] Change the itunes library default path. <sep> (A) [step] In order to move your library to your external driver, you must first check to the " library " menu--] computer] itunes. If you can't find the library option, go to, " my computer " and select " change library ". (B) [step] If you don't have the selected default path selected, select the option " new library " to move it to itunes's default path. [title] Move the library icon in the library window. (C) [step] In the " store your itunes library " window, click " manage library data ". In the " accessories " window, hover over " display " and put " itunes info from itunes store " in the same window. (D) [step] On the same " preference " panel, click " change " button, then you can customize the itunes library storage directory to your external driver path. Then every time you download items from itunes, it will be saved in the customized path automatically.

D