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". 

Q: [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.

A: B
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Q: [header] How to make green enchiladas [title] Wash the chicken. [step] Rinse each chicken part thoroughly in cool water, then pat them dry with paper towels. [title] Poach the chicken. <sep> (A) [step] Cut the chicken in half, then run a slotted spoon along the sides to allow the chicken to cook evenly. Poach for half an hour, or until the chicken is tender and no longer have its skin burned. (B) [step] Melt the olive oil in a saucepan over medium heat, then add the chicken, poaching mixture and poaching water. Use a wooden spoon to stir well, then place the chicken in the oven. (C) [step] Place the chicken pieces in a large pot. Cover with an inch of water and sprinkle in a teaspoon of salt. (D) [step] You'll need about 8 tbsp. ( 240 ml) of chicken fat, since it will cook in the broth.

A: C
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Q: [header] How to heal gums after a tooth extraction [title] Bite tightly on the gauze. [step] After a tooth extraction, your dentist will place a gauze on the wound to stop the bleeding. Make sure to bite down tightly on the gauze to apply pressure to the area to stop bleeding. <sep> (A) Applying too much pressure or twisting your jaw violently can cause additional bleeding. [substeps] Other dental care strategies for bleeding include using warm water to keep the gauze clean and dry and cover gauze with a bandage as an extra cushion. (B) [substeps] If a tooth extraction is required, your dentist will prescribe you a regular prescription that you can take on your own. This can be useful for at a later date if the wound is uncomfortable and gets infected. (C) If heavy bleeding continues, you may need to reposition the gauze pack to cover the wound more directly. [substeps] Do not talk, as this may loosen the gauze and lead to further bleeding and delay the clot formation. (D) [title] Apply pressure for as long as the recovery time calls for. [step] For the first month after a tooth extraction, expect to experience little or no pain.

A:
C
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