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 get a life [title] Define what a life is to you. [step] This notion of " a life " is subjective. You need to reflect on what is important to you. <sep> (A) Who does what matters to you? Does your job matter? What is your house like? Is anyone there to support you? Where do you see yourself in five years? How would you do without your parents' help? [title] Read about careers. [step] There are many different careers available to you from young age to very young age. (B) You can think about all the great things you have, but find out what (or what) matters to you most the most: don't be forcing perfection on yourself, but list what matters to you the most. [substeps] Many people struggle to define what a life is to them because they " don't know. (C) Not only that, but you need to consider why the person with whom you consider a life is important to you. A life is best made up of three elements: a home, a job, a significant other, and so forth. (D) What do you want to achieve in life? What makes you happy? Only once you think about those kinds of things will you begin to realize how to attain a life. [substeps] Don't let others define a meaningful life for you.
Example Output: D

Example Input: [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.
Example Output: C

Example Input: Two women in a child are shown in a canoe while a man pulls the canoe while standing in the water, with other individuals visible in the background. the child and a different man <sep> (A) are then shown paddling down a river in a boat while a woman talks. (B) are driving the canoe, they go down the river flowing side to side. (C) sit in a canoe while the man paddles. (D) walking go down the rapids, while the man in his helicopter almost falls and goes out of canoehood.
Example Output:
C