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 man demonstrates how to walk across and navigate a slackline in a grass courtyard in front of apartments. the man <sep> (A) demonstrates how to traverse a low brick fence on a residential street. (B) walks slowly across the slackline while talking and stopping to talk to passerbys. (C) stands on a slackline balancing himself with his arms before the clip cuts to him interviewing. (D) poles backward, glasses on and he begins to walk while holding the slackline while walking across the courtyard.

Ex Output:
C


Ex Input:
[header] How to make black coffee [title] Purchase freshly roasted, whole bean coffee. [step] If you can't purchase it directly from the roaster within a week or so of it being roasted, opt for a vacuum-sealed bag from a reputable national coffee-bean roaster. [title] Purchase your own coffee grinder, or grind it in the store. <sep> (A) [step] If possible, choose a burr grinder in place of a normal blade grinder. For best results, grind the coffee fresh right before brewing each day. (B) [step] Grind coffee beans in the near-black zone of a coffee grinder. You can use either a regular-size grinder or a pre-grind grinder to grind your coffee. (C) [step] Modern coffee grinders have drawbacks, as they require higher temperatures to make purified coffee. Where possible, purchase one that comes pre-boil. (D) [step] Print it onto a piece of paper, remove the lid from the coffee grinder, and grind the coffee beans in the machine's center. [title] Unplug the coffee grinder and plug it into the wall outlet.

Ex Output:
A


Ex Input:
[header] How to deal with a controlling spouse [title] Stay calm. [step] For many people, arguing is a natural response to a spouse's controlling behavior. Unfortunately, a controlling person is unlikely to submit and let you win the argument, so this tactic will likely only escalate the situation. <sep> (A) Instead, stay calm and find ways to resolve your conflict. [substeps] Take a step back and collect your thoughts. (B) You and your spouse may disagree on many issues, especially important to a child or toddler : [substeps] One parent cannot take over the entire household all by themselves. The child or toddler has to ask for their parent's help and parents let the other parent handle the children, rather than take charge. (C) Remind yourself that you can't argue with this person. If you communicate assertively, your spouse will understand. (D) Instead of arguing, stay as calm and collected as possible. You can disagree with your spouse without yelling or being disrespectful.

Ex Output:

D