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 Q]: [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.
[EX A]: C

[EX Q]: [header] How to whitewash trim [title] Set up your working area. [step] Cover the floor with a drop cloth to keep dust and whitewash off of it. Open screened windows and doors to provide ventilation. <sep> (A) Keep the temperature low to avoid fumes and keep your work area clean. Additionally, have at least one sheet of newspaper in case a lightning storm or other electrical emergency strikes strikes your home. (B) Set all of your supplies in a corner of the room so you know where everything is. [substeps] If you don't have a lot of experience painting, use painter's tape to tape off areas you don't want to get whitewash, like the walls. (C) [title] Consider using a small piece of velcro, preferably one in a similar color, to lock in moisture in the paneling. [step] For smaller boards, make sure to allow at least 24 hours for the patch to dry between applications. (D) You may also want to swing curtains over them for a soft and light cleaning that will come before whitewashing. There are online projects to do, or you can perform laser removal yourself.
[EX A]: B

[EX Q]: [header] How to design a front porch [title] Go for a farmhouse porch if you like an old-fashioned look. [step] Farmhouse porches are open and inviting, and they're perfect if you want a comfortable and practical style. Because the design of most farmhouse porches involves a simple trim and design, they are especially unpretentious. <sep> (A) [substeps] Farmhouse porch designs pair well with wood, wicker, and cast iron furniture. Most farmhouse porch designs are low-rise and good for those who have trouble with stairs. (B) [title] Consider a rustic porch if you enjoy a sleek, modern look. [step] Farmhouse porches can have a rugged, contemporary feel that tends to be relaxed. (C) [substeps] They are accessible from a concrete driveway or barn. [title] Opt for craftsman vintage woodwork if you want a sophisticated look. (D) You might also opt for a barn-styled porch if you prefer a more rustic feel. [substeps] Barn-style porches can be rectangular on one side, and have rails posts at the top that trim to create a ladder-like design.
[EX A]:
A