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 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.
Example Output: C

Example Input: [header] How to kosher liver [title] Be particular about the liver you buy. [step] The liver should come from a kosher species (cow, calf, or chicken) that was slaughtered in the matter described by the torah. [substeps] The fats of the liver should have been removed during the time of slaughter. <sep> (A) Ideally, you should purchase liver from an animal that was slaughtered no more than 72 hours ago. The koshering process itself should be performed within 72 hours. (B) If the animal is injured or besides getting sick, this meats are extremely likely to be a nutrient rich predator in the long run. It's equally important that they are properly labelled. (C) The pits of the liver are flat so the meat itself remains at all times. The meat also wears down over time, which means a carcass will retain more fat, protein, and fat. (D) Some animals such as cattle or ducks should be juiced in the same manner, for more flavor. Machamps (cow or goat, mixed in fat or marbling) should be roasted in a batserver and let stand 20 minutes before cooking.
Example Output: A

Example Input: Band members in full dress stand in a yard. They are using a rake to rake leaves. a man <sep> (A) walks next to them supervising. (B) is shearing up the weeds. (C) stands in front of the camera taking pictures. (D) walks by as they rake.
Example Output:
D