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 transfer files between google drive and microsoft onedrive using backup box [title] 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 your google drive account by clicking the' new connector' option from the connectors dropdown menu. <sep> (A) [step] Indicate the default address for your account. [title] Find the files you'd like to convert. (B) [step] ( it should say " start here! "). Follow the instructions to grant backup box access to the account you are connecting to. (C) [step] Click from the left of a link and choose' inbox'. [title] Click' add' and select your preferred email account. (D) [title] Click on' accept' on the link provided here. [step] Choose the country in which you wish to transfer files.
Output:
B