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". 

[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.
C

[header] How to install debian [title] Back up any important files on your computer. [step] Installing debian on your machine will clear your entire hard drive and reformat it, erasing all data in the process. Store your important information on a removable drive before beginning the installation. <sep> (A) [title] Navigate your web browser to the debian website. [step] Debian is distributed through www.debian. (B) [substeps] If you don't own one, ask a sales associate at your bank to store your files in your. Otherwise, you can install them on your own hard drive. (C) [title] If debian has dependency on your operating system in the previous step. [step] Some debian programs allow for debian to be connected to external storage like the usb connector, vertical port or the simplest root driver. (D) [substeps] Make sure to click the " save/install " button right on the back of the removable drive. [title] Locate and modify the " reason for installing debian " website.
A

[header] How to dress like a guy [title] Find casual pants with a masculine fit. [step] Casual pants that fit well are a staple in a male wardrobe, as they can be worn in most everyday situations. [substeps] Jeans are the most versatile pant. <sep> (A) They should be worn an inch or two lower on the waist than chinos or corduroys, about three to four inches below your navel. Jeans should have a consistent fit throughout the leg. (B) Baggy trousers are a classic look, but if you're looking for something super casual, go for pants that are the opposite. [substeps] A motorcycle jacket with a leather strap can also be a trendy style. (C) If you're hanging out in the gym wearing jeans and other workout attire, it's best to find pants with a com-com nature. [substeps] Com-com pants tend to be denim that is designed to look similar to sweatpants for women and long sleeved tops for men. (D) Guys tend to wear straight, streamlined trousers over tight shorts or long skirts in summer or late evening. [title] Pick jeans that are a little out of style.

A