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]: Man is unning wearing stilts in a skaet park. another man <sep> (A) is intoeyete a line ofdifferent people playing stilts on the park. (B) is jumping along with the first man in the skate park. (C) is unhing a calf thnke its in stilts starting to run with them. (D) is unrolling accordions.
[EX A]: B

[EX Q]: A little boy playing on a jungle gym. He is climbing up a set of stairs. now <sep> (A) he runs up even higher and climbs to the top again. (B) he is at the top and he starts climbing all the way up again. (C) is sliding fast down a slide. (D) , he is being pulled up the sliding slide and on to another set of stairs.
[EX A]:
C