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". 

Example Input: [header] How to use psychology to close more sales [title] Give something for free. [step] The principle of reciprocation is a psychological phenomenon described by dr. robert cialdini, an expert in persuasion. According to this theory, it is part of human nature to feel obligated to repay debts of all kinds, big and small. <sep> (A) To begin this process, ask yourself if you really are willing to sell something for free. If you are willing to throw in the money, then you are probably willing to take credit. (B) You can't force anything on someone else. [substeps] If you " feel " obligation to a friend or loved one, give them something to ask you " if i use this method, what will happen? " [title] Assemble your argument. (C) If someone receives something free, they will feel a psychological urge to purchase a product to pay you back for your kindness. [substeps] Offer a free trial period, a sample, or even a pleasant experience. (D) To do this you must pay for or at least accept the full offer. After that you must devise a plan of compensation.
Example Output: C

Example Input: [header] How to determine who has right of way [title] Come to a complete halt at a stop sign or red light. [step] At a stop sign, come to complete halt for about 2 seconds or until vehicles that arrived before you clear the intersection. If you're stopped at a red light, proceed when the light has turned green. <sep> (A) This will give you enough time to catch the light and clear the intersection. [substeps] Vehicles behind or behind you may not brake. (B) This blocks oncoming cars from passing you. [substeps] If in doubt, you can also tell if you're going too fast by looking ahead at the tires of that car. (C) If you are stopped before a red light signals for another vehicle, you're on your own. [substeps] This means every car crossed before you has passed, and every vehicle in the intersection has stopped before you. (D) If the intersection has a white stripe in your lane, stop before this line. [substeps] If you have a stop sign, but the street you're crossing does not have a stop sign, wait until all traffic has cleared before crossing the intersection.
Example Output: D

Example Input: [header] How to cook kangaroo steak [title] Thaw out your steak until it is room temperature. [step] Take the kangaroo steak out of your refrigerator if you marinated it or out of your freezer if you did not. Then, place it on a cabinet or table and let it thaw to room temperature. <sep> (A) [substeps] Be sure to thaw your kangaroo meat well after cooking. If it has not properly marinated, it will disintegrate, which may make it not come out as fresh. (B) [substeps] Be very careful handling kangaroo steak during freezer time. Do not touch it, boil it, or eat it raw. (C) [title] Rub herbs and spices into your steak for taste. [step] To give your steak some additional flavor, try covering each of its sides with some simple herbs and spices. (D) [title] Remove the kangaroo steak from the package and snip off the bottom part of it. [step] Cut off all the seeds and skin.
Example Output:
C