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 woman cleans a cafeteria floor with a mop while occasionally talking to the camera. the woman <sep> (A) uses a mop on the floor under her chair and in a bucket. (B) uses the mop around the tables and some seating areas as well as around fork corners. (C) uses a mop nozzle to clean the floor. (D) walks to and cleans a different part of the cafeteria floor.

Ex Output:
D


Ex Input:
[header] How to change a drill bit [title] Loosen the chuck. [step] The chuck is piece on the end of the drill that loosens and tightens to hold the bit. Grasp the chuck with one hand while you hold the handle of the drill with your other hand. <sep> (A) Loosen the chuck by sliding the drill bit along one side. If you have known it already, it will already be loose, but there is a screw on the end of the piece that holds the bit in place. (B) Use extra leverage as you slowly press down on the chuck to loosen it. [substeps] Keep your eye on the chuck while you are tightening it. (C) Twist the chuck counterclockwise to loosen it. Another option is to pull the trigger gently while holding the chuck. (D) Begin to tighten the chuck by turning it clockwise so that the chuck remains firmly in place. Use your wooden allen or long-handled allen key to turn the chuck clockwise until it is firmly within the drill's circle.

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