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". 

Q: [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.

A: C
****
Q: A grey african parrot walks up to a coffee mug filled with coffee. He takes a drink, then walks away. he <sep> (A) turns around and begins drinking from a different mug. (B) returns and grabs a second cup. (C) comes back and grabs the mug. (D) stares down at the coffee mug.

A: A
****
Q: The lady puts a paste on a window glass. The lady use a rug to wipe off the paste on the window. the lady <sep> (A) puts a pigment on the mirror. (B) uses a clean rug to wipe over the window again. (C) uses carpet cleaner on a chair. (D) wipe some powdered sugar onto a box and rub it on the window.

A:
B
****