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".

Input: Consider 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.

Output: C

Input: Consider Input: People are seen walking around a neighborhood with some walking dogs. A young girl walks a dog around the area. another man <sep> (A) walks on a leash behind the dogs. (B) walks in and out of frame while juggling balls. (C) follows her from behind. (D) walks a horse and leads into credits showing horse grooming tools.

Output: C

Input: Consider Input: [header] How to buy pet training supplies [title] Visit the pet store. [step] Go to your local brick-and-mortar store are browse the shelves for possible training items. The stores are generally organized according to animal so you should have little difficulty finding the section that you need. <sep> (A) [title] Know your need for training or purchasing materials. [step] Learn the proper types of supplies, and research the requirements before proceeding with your training process. (B) [substeps] Look in the follow guide to find a pet store that specializes in training, however you want to make sure that the store does not possess pet equipment that could cause injury or harm. [title] Make sure that they offer the required training. (C) Ask store workers about items that they would recommend or avoid. [substeps] One way to get an extra level of insight is to ask workers, " what training items are frequently returned and why? " this tells you the training supplies that you should generally avoid due to the high level of customer dissatisfaction. (D) [substeps] Pet stores offer places to buy training supplies and staff, so ask if there is a complete list of supplies before buying them. Many stores are privately owned so they cannot charge.
Output: C