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".

[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.
C

[header] How to create a beauty regimen for oily skin [title] Make sure that your skin is oily and not another type. [step] Do some research on the topic. Whether it be online or with a dermatologist. <sep> (A) What does the oily undertone mean to you? How can you get rid of it in appearance and makeup? [title] Consult a dermatologist. [step] See if they would recommend a beauty regimen for oily skin. (B) Look for people who specialize in beauty products like foundation, moisturizer, primer, and eyelid gel and prepare with them. You will probably want to know if your pores are smaller or more visible. (C) You may think you have oily skin, but you may have combination or normal skin. [title] Look for products in stores suited for oily skin. (D) Make sure that your skin is dry and that it is scrubbed with a gentle cleanser, toothbrush, or a mild moisturizer. [substeps] Ask the dermatologist to examine your skin to get an idea of its ideal oil levels.
C

The men are back in the area where they first started talking and are pointing in areas that look like they're pointing out their course. the men <sep> (A) are standing in a circular formation doing two fencer social sitters with one another. (B) are now playing croquet in the large grassy area and they're taking turns hitting the croquet balls, smiling, and talking the whole time. (C) were talking about things in the same area but kept the area. (D) are gathered in a circle on the floor with their feet as they talk.
B