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". 

Example Input: [header] How to post to a facebook group on pc or mac [title] Go to https: // www.facebook.com in a web browser. [step] You can use any web browser, such as chrome or safari, to access facebook. If you're not already signed in, sign in now. <sep> (A) [title] Click on the downward-facing arrow in the top right corner of the screen. [step] It's at the top-right corner of the screen. (B) [title] Click your profile picture at the top-right corner of the page. [step] You will see your profile picture in the upper-right corner of the page. (C) [title] Click a group to open the group's menu. [step] Click the group on the right sidebar, or the group's upper menu of options. (D) [substeps] You must already be a member of a group to post to it on your computer. See join groups on facebook to learn how to join a group.
Example Output: D

Example Input: [header] How to host a housewarming party [title] Make a guest list. [step] You should start keeping a guest list before you start working on the invitation. Be sure you include any friends, family, and coworkers that you would like to invite into your new home. <sep> (A) This will help ensure that the party is pleasant and enjoyable for your guests. Make sure that the guest list is segregated in different places. (B) [title] Decide ahead of time whether you will invite guests with a " weekly " or " annual " package. [step] You should also design and print out your invitations carefully and make sure they reflect how the party will look. (C) [substeps] Limit the guest list to the number of guests appropriate for the amount of space you have available. If you have a small space, consider hosting 2-3 smaller parties rather than one big one. (D) This way, parties are easier to plan without the need for many less specific guests. [substeps] Include guests that you know will be a good fit for your home's atmosphere.
Example Output: C

Example Input: [header] How to get an ffl license in texas [title] Meet the federal requirements for an ffl license. [step] The atf requires you to be 21 years of age, have a business venue for selling firearms, and to not have a history of criminal actions, mental illness, and dishonorable military discharge. [title] Acquire the ffl license application. <sep> (A) [step] The atf website has a suite of requirements required to gain an ffl license. To fulfill them, you must have the following : [substeps] Be at least 18 years old. (B) [step] You can be a us citizen, a u.s. citizen, or any other you can think of. (C) [step] You can obtain the application online from the atf website or from an atf regional office from either the dallas or houston areas. [substeps] Click on the atf website link shown in the sources section of this article and locate the " necessary materials " section on the right. (D) [step] The aap international license application requires they to be at least one year old and related to the requested licenses. [title] Conduct an online search for a license application.
Example Output:
C