Q: 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 transfer files between ftp and dropbox using backup box [title] One method is to use a tool named backup box, which is a website built entirely to help people transfer files between different services. [title] Quickly create an account by entering your preferred email and password. [title] Authorize the account you are transferring from, eg. <sep> (A) [step] Ftp, by clicking the " add new source " button at the top-left hand side of the page. [title] Follow the instructions to grant backup box access to the account you are connecting from. (B) [step] Your ftp name in front of the service should appear on your ftp and dropbox. [title] Before the online dd copying process, open the ftp folder on your computer using the save dialog box. (C) [step] [substeps] If you are transferring files between two different services, then click " allow " in the top right corner, then click " done " in the popup. [title] Choose the dropbox to import files. (D) [step] Stumbleupon will ask for email and password for you to sign in. [title] After verifying the user has registered the account you would like to transfer, click on the " submit request " button to create an account to transfer files between dropbox and dropbox.
A:
A