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 Input:
A indoor course is panned with camera in a warehouse setting. an athlete <sep> (A) runs on the course with a javelin, catching it about six times in the air before returning to throw again. (B) runs down a track and pole vaults over a high bar and onto a cushioned landing pad. (C) runs through the course exhibits. (D) performs a routine on the course taking long spins around turns.

Ex Output:
B

Ex Input:
[header] How to ombre paint a dresser [title] Decide upon a horizontal or vertical ombre effect. [step] Ombre painting simply means painting in a gradient, employing different shades of the same color to create the effect of fading. Before painting your dresser, decide if you want to create an ombre effect from top to bottom or from left to right. <sep> (A) [substeps] Horizontal ombre painting means painting up and down, crossing between shades of black and white to create a rainbow effect. Vertical ombre painting means painting one long, continuous shade of black to create a sun effect. (B) [substeps] Shaded shades are generally the brighter and fatter shades, while shades of metallic color may tend to lend the illusion of an ombre effect. [title] Lay your dresser on its side and extend it to the top. (C) [substeps] If your dresser has drawers stacked vertically, you can paint each drawer face a different color. This will make top-to-bottom ombre much easier. (D) In some cases, all you need to do is paint side and right for various shades. In other cases, though, you may only paint the outer edge of the dresser or have it to either to the right or left, depending on your model.

Ex Output:
C

Ex Input:
[header] How to build a personal desktop computer [title] Prepare the mainboard (motherboard). [step] If you want to assemble the well-liked device, you should use intel i3, i5, i7 mainboard. [title] Mount the cpu in the socket of the mainboard. <sep> (A) [step] If the motherboard is necessary, you may mount it on the side of the mainboard. [title] Determine if your pc will break in half (eject). (B) [step] You must choose the correct cpu for your motherboard, and install it according to its instructions. [title] Connect the cpu cooler to the mainboard. (C) [step] You should do this with the cable slots facing outward. [title] Add the adapter with cpu attach (within reason). (D) [title] Order the components from the mount bar at the front of the motherboard. [step] Ensure they're all in order properly, and then attach software to the motherboard.

Ex Output:
B