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:
A group of men plays soccer in a sand area. a crowd <sep> (A) watches the game and applauds players riding in stadium waiting for their turn. (B) watches as several goal is made. (C) watches from the the stands. (D) watch and takes pictures as the teams walk up and down the field.

Ex Output:
C

Ex Input:
A boy grabs the rope and goes in the water after the boat. The boat begins to speed up. the boy <sep> (A) falls from the boat onto the board. (B) is pulled back on the rope. (C) is brought to his feet and begins to water ski. (D) balances the sail and continues pulling the rope in the water.

Ex Output:
C