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:
[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.

Ex Output:
C


Ex Input:
A black object appears and the woman is now placing it onto a long pole, she's back on the ladder and she's using the black object to help her hold up the border wall paper as she applies it all along the wall. when the woman <sep> (A) finishes the wall paper is covered by a blue curtain and she begins to pull the white rod back and forth as she continues to use the soldering iron to create the wall paper. (B) has drawn a border on the wall, she stretches up to get a better hold, three inches above the floor leaving the wall covered in white paper. (C) is done plastering, she takes the phone back and the actual wall paper is now in place and it seems to be the perfect size, exact size and it has sparkles, three big black holes in it and it has the laminate look to make it look very clean. (D) is done the camera pans to show the finished job and the outro appears that includes the website, company name, price and phone number.

Ex Output:
D


Ex Input:
[header] How to care for norwegian forest cats [title] Select a high-quality cat food. [step] Keeping norwegian forest cat in peak physical condition requires some high-quality cat food. Take care to choose a high-quality cat foot that will meet all of your norwegian forest cat's nutritional needs. <sep> (A) You can buy commercially prepared cat food or purchase mousse that is formulated for cats. [substeps] Cat food can be expensive so make sure to buy kitten or lake cat food as well as store bought cat food. (B) [substeps] Decide whether you need a commercially prepared cat food. You may need a dog food or veterinarian meal formulated for norwegian forest cats. (C) [substeps] One good way to select a food for your cat is to read the ingredients. The first two ingredients listed on the package should be meat (not meat by-products). (D) Stay away from cat food that's too loose and chewy, as they can choke on the food. [substeps] Keep in mind norwegian forest cats don't like moist conditions, so they don't like bland foods.

Ex Output:

C