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 bend rebar [title] Understand the structural issues possible with manually-bent rebar and know how to avoid them. [step] When you bend metal, you naturally weaken it. When done correctly, however, you can minimize damage and still get the shape you need to complete the project. <sep> (A) [substeps] Badly bent rebar acts as a buffer for the metal particles of the laser beam. The piece of rebar you are bending dissolves when squeezed into contact. (B) This effect is part of the re-bend method. The process is a little different than rebending a rubber band, but the difference is that you bend it in half by simply opening up a v on each end. (C) Because of this, it's important for you to know how to modify the shape you want the rebar to be. If you have a badly bent rebar, you'll likely create grooves in the rebar that introduce excess material. (D) Keep the following in mind as you work : [substeps] Always note the grade and size of the bar you're bending, checking against the equipment you're using to ensure it works. Check with your project engineer to ensure your bends meet the minimal internal bend diameter.
[A]: D

[Q]: [header] How to make garlic dill pickles [title] Find 3 lbs. [step] ( 1.5 kg) of pickling cucumbers. Make sure not to buy waxed cucumbers. <sep> (A) The peel when standing before making pickles, will break the cucumber. [title] Squeeze the leaves, lemons, celery, tomatoes, onions, bell peppers and salt into the pickling product. (B) Grinding the cucumbers with an empty oyster, will grind them better at greater speed. [title] Process the cucumbers and squash in the grater. (C) Cut them into wedges : 14 centimeter (2.9 in) wide , 16 centimeter (7.6 in) wide and 12 centimeter (5.1 in) wide. [title] Find a 3 pound (2.6 kg) jar or container for about 5 grams of garlic per pint. (D) Try to find cucumbers of less than 4 inches (10 cm) at a farmer's market or natural food store. [title] Decide if you will cut your pickles or pickle them whole.
[A]:
D