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 calculate a light year [title] Define the light year. [step] A light year is a measure of distance equal to how far light travels in one earth year. Because distances across the universe are so large, astronomers use light years. <sep> (A) However, they can also be determined by dividing by a distance. [substeps] Some light years are used year-round. (B) For light year 2014, the main determiner is the sun. In the light year, the world is filled with light bulbs. (C) Without light years, discussing the distance between two stars would require the use of large, unruly numbers. [substeps] Another measure of distance you may come across when learning astronomy is the parsec. (D) [substeps] There are two kinds of light years: day and night. The two types of light years are known as night and day.
[A]: C


[Q]: [header] How to stay calm during road rage [title] Recognize your rising anger. [step] The most obvious signs of anger are often physical symptoms that emerge after the fact (like voice tone, language, and gestures). But with practice, you'll learn to recognize the warning signs of anger when you mentally check in on yourself. <sep> (A) When you're angry, you'll recognize them as part of your subconsciously hunting instincts. [substeps] Common signs of anger include: a car slamming on its brakes or a fire ensuing, which should be quickly and unequivocally obvious. (B) Your body is responding to these moods : [substeps] Your heart rate increases or drops. Your heart is racing, your breaths are rapid, and you're sweating. (C) [substeps] Most of your response time should be repetitions of the actions or sentences that trigger your anger. Often, this response is triggered by one or more things that remind you to be relaxed, both positive and negative. (D) [substeps] Common signs of anger include angry/vengeful thoughts, muscle tension, headaches, or elevated heart rate. If you catch yourself speaking out loud (even when you're driving alone) about another driver, you may be experiencing elevated anger.
[A]: D


[Q]: [header] How to do cheetah print nails [title] Look for black, brown, and beige nail polish. [step] To create the full cheetah print effect on your nails, you will need to get nail polish that is black, brown, and beige. These three colors together will create a fun cheetah print. <sep> (A) If you really want the cheetah print to be a permanent thing, you will need to get nail polish that is specifically made for this color scheme. [substeps] You can find nail polish products that are similar to the colors of your nails online or at your local hardware store. (B) For best results you should go for black, brown, and beige. [substeps] For example, if you have black nail polish, your dominant nail polish color for this project should be black, brown, and beige. (C) [substeps] Create the upper edge of each nail by using your hands to create a two-dimensional layer of polish on each nail. As you do so, periodically swipe the polish in upward strokes on each nail, as well as along each nail's edge. (D) [substeps] You can substitute the beige for a gold or cream color, based on your preference. If you would like a more colorful cheetah print, you could use a bright color like pink or blue instead of the beige.
[A]:
D