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". 

A woman is playing a set of bagpipes in a room. she <sep> (A) begins to tap on the instruments, trying to play them in tune with each song. (B) laughs as a man helps her adjust the pipes, and continues to play. (C) goes back and forth, and she doesn't seem to be confident in her play. (D) strums them as she moves with the music.
B

[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.
C

[header] How to resolve disputes between a surviving spouse and children of another marriage [title] Talk to the other party. [step] Since mediation is a voluntary process, it's essential that the other party is willing to attempt mediation to resolve the dispute. Emphasizing the benefits of mediation over litigation can help persuade them. <sep> (A) Although mediators often focus on the benefit of the child custody arrangement, independent dispute resolution has been discussed in more substantial contested cases. Mediation also helps both parties understand the extent of the dispute and how he/she needs to be treated. (B) [substeps] Reach out to the other party and see if they feel they can find settlement without a trial. If so, you and your spouse will proceed in " arbitration. (C) Conflict resolution means accepting responsibility for what happened and agreeing on a solution. [substeps] If possible, present a broad understanding of the issues being settled, and explain that you don't wish to participate in mediation. (D) [substeps] Mediation is a collaborative process designed to help both parties find a mutually acceptable solution to their dispute. You have a lot of freedom to be creative with your solution, including finding a compromise that would not be available if you had a judge resolve the matter through traditional litigation.

D