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 buy a light kit for photography [title] Make a list of required and/or desired criteria for your light kit. [step] These features include whether you want lights arranged on the floor or ceiling, what kind of photography you will be doing, how many lights you will need, etc. [substeps] Floor studio lights and backgrounds can be transported and arranged on stands or supports. <sep> (A) You may want several different lighting items in one kit. There are many available but most of the light hardware items, like dimmer switches and binders or small set of battery-powered lights, should be picked up at a craft store. (B) Pointed, straight, or one-sided lights can be divided into categories and arranged on tables or on poles. [title] Purchase fixtures that fit the gender and the type of lighting and coloring range that you want to consider. (C) Ceiling lights are more expensive and must be on a rail system for positioning in a rectangular area while background rollers are mounted on the ceiling. Your type of photography can determine how much light you need. (D) Frame sizes can be adjusted to your personal preference depending on the size of your studio. Don't forget to read the product description as well.
Example Output: C

Example Input: A close up of sneakers is shown followed by a person holding up various objects and mixing them together in a bowl. the person <sep> (A) then sets the bowl into a kettle while using tongs to grab the contents and then plays with the sticks inside. (B) pours more and finally puts them in the bowl together. (C) bowls a portion of the action into a cup and continues using the objects throughout. (D) then uses a tooth brush all around the shoe using the ingredients and showing off the shoe.
Example Output: D

Example Input: [header] How to increase breast milk production [title] Consume a minimum of 1 , 800 calories a day and drink at least 6 glasses of fluids while you are lactating. [step] If you're currently dieting, it could be decreasing your milk production. Unsurprisingly, what you eat has a big impact on the quality and quantity of the milk produced. <sep> (A) Here are some general guidelines for you to remember about diet and breast milk : [substeps] Find excellent sources of calcium. These will help your little baby's little bones grow healthy and strong. (B) [title] Eat 4 to 6 cups of milk per day. [step] If you're currently underweight, aim for 25 to 35 cups per day. (C) A list of guidelines for how much you should consume might be printed on the back of your bottle. [substeps] For example, you may want to limit your milk (97 g) to about 2 glasses of water per day. (D) [substeps] Women in the first month of pregnancy generally need between 80-400 calories a day. Men in the third month will eat within 15-30% of this extra calorie.
Example Output:
A