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 install a bakflip hd tonneau cover on a ford f150 [title] Place the rail of the bakflip hd on right hand side bed rail of the f150. [step] Slide the tonneau rail all the way forward to the bulk head. It is a good idea to have a squeeze clamp or similar to hold it in place. <sep> (A) [title] Slowly turn the bakflip over so it moves slowly, its going to wobble and have to be bent the opposite way of the rail. [step] Be prepared for a lot of bumping. (B) [title] Tightly wrap round tray socket on right hand rail over cover and fasten. [step] Compression disks complete a swivel mounted over rail. (C) [title] Place the included rail clamps in place. [step] Tighten with a wrench or socket. (D) This will prevent the oil from jumping up and down accidentally while the g2 is being painted. [title] Place the nikon bolt assembly inside the couplers cradle.
C

He then discusses what to do when a sunburn does occur, how to handle it to take care of your skin. a slide <sep> (A) shows that he should be in a building showing how to iron, then he begins by giving the results of another remove. (B) shows a person's finger and toe nails are shown before he jumps on an ironing board to iron. (C) show of a razor obtain; first is placed in a glass, then in a bowl. (D) is shown to make us aware of when a sunburn is bad and needs medical attention.
D

[header] How to treat mites in chinchillas [title] Separate your chinchilla from other pets. [step] Place your chinchilla's cage in a room where other pets don't go. With a little luck, you can reunite your chinchilla and your other pets in a few weeks. <sep> (A) This may prevent mites from re-infesting your nest and lead to your chinchilla finding everything it needs. [title] Change to a warm, dry environment. (B) [substeps] Try to put as much distance between your chinchilla and other pets. Don't move toys or other objects from your chinchilla's cage to another pet's cage without cleaning them. (C) This works best with small to medium chinchillas. [substeps] When traveling your chinchilla should be kept indoors, because space can get thin. (D) When you wait, walk around or put your chinchilla in another room. Do not let it out for a day or so without checking on it.

B