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
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Q: The people start the race behind a closed and grated fence, which then opens and allows them to start racing from an elevated platform down onto the paved raceway. the racers <sep> (A) pedal with one person in a white jacket in the lead. (B) pass snow covered stands along a hilly road up above the as they ride up the hill past the tight stands and sandy roads of the garage. (C) sit against the wall on the track as they wait for the race to start. (D) pass through gaps while the passengers attempts to stay ahead.

A: A
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Q: [header] How to make a cosmopolitan [title] Chill the martini glass. [step] Fill the martini glass with ice and leave to cool while you prepare your drink. [title] Mix the ingredients. <sep> (A) [step] Do this by wiping the inside of the martini glass with a clean, dry towel and then quickly pouring the martini's contents into the shaker. Shake the contents vigorously for 2 to 3 seconds until well mixed. (B) [step] In a blender or food processor, whip together the components needed to make a cocktail shaker with 1/3 of the ingredients. When the gelatin is dissolved, add 1/4 of the lemon zest and 4/4 of the tequila. (C) [step] Place the brandy, two beers and crème brûlée in the cocktail shaker. [title] Dispense the brandy into the shaker. (D) [step] In a mixing glass, combine the vodka, orange liqueur, and cranberry juice. [substeps] You can use single shot and double shot measures if you're making several drinks at once.

A:
D
****