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". 

Ex Input:
[header] How to install custom firmware [title] Record the router's model and version number. [step] These numbers are usually located near the manufacturer's logo, underneath or in back of the router. Write down the model and version information for future use. <sep> (A) [substeps] If you are using windows xp (default operating system), the model number can be found in the start menu under " system settings. " skip all the discussion menus, and then go to system preferences. (B) [title] Obtain the router's ip address and default gateway for your computer system. [substeps] Determine the ip address and default gateway for a pc. (C) [substeps] " w " with the green background is the serial number for the model. " p " with the red background means " unhappy operating system. (D) [substeps] It is easy to determine what operating system is running on your router if you don't know the model. Copy the model from the registry to convert it to your operating system.

Ex Output:
B


Ex Input:
There are people on personal sailboats and they're holding onto their sails, leaning as far back as they can. a woman wearing a hat, wetsuit and a lifejacket <sep> (A) is sitting in the water and she's holding fruit and reading a book on a tablet. (B) is standing in rear of the sail the boat is on. (C) is seated on the lifebuoy. (D) is sitting on her sailboat and holding onto her sail and steering.

Ex Output:
D


Ex Input:
[header] How to survive a bar fight [title] Try to defuse the situation. [step] Even if the guy is being a jerk, getting into a fight with him will only cause you trouble. If you win, you will still get kicked out of the bar and could face criminal charges. <sep> (A) Don't go into the situation expecting that you will win the fight. If you pick up on his anger, it could end up hurting his feelings. (B) If you lose, you could wind up in the hospital. Do your best to talk your potential opponent out of a physical confrontation, even if it means admitting you were partly responsible. (C) Try to defuse the situation so you can get the life you want. [substeps] If you win, you will still have to pay the price. (D) Resorting to yelling, insults, and excuses will only hurt you and the person who is being the jerk. [title] Scream at the top of your lungs.

Ex Output:

B