TASK DEFINITION: In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.
PROBLEM: Article: Life in the Clear Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between the surface of the ocean and a depth of about 3,300 feet--as far as most light can reach. Most of them are extremely delicate and can be damaged by a simple touch. Sonke Johnsen, a scientist in biology, says, "These animals live through their life alone. They never touch anything unless they're eating it, or unless something is eating them." And they are as clear as glass. How does an animal become see-through? It's trickier than you might think. The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and scatter light, bouncing it away from its original path. Others absorb light, stopping it _ in its tracks. Both scattering and absorption make an object look different from other objects around it, so you can see it easily. But a transparent object doesn't absorb or scatter light, at least not very much, Light can pass through it without bending or stopping. That means a transparent object doesn't look very different from the surrounding air or water. You don't see it ----you see the things behind it. To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they contain pigments that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb light. According to Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering. Animals are built of many different materials----skin, fat, and more----and light moves through each at a different speed. Every time light moves into a material with a new speed, it bends and scatters. Transparent animals use different tricks to fight scattering. Some animals are simply very small or extremely flat. Without much tissue to scatter light, it is easier to be see--through. Others build a large, clear mass of non-living jelly-lie material and spread themselves over it . Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear for these larger animals, staying transparent is an active process. When they die, they turn a non-transparent milky white.
Question: One way for an animal to become transparent is to _ .
Options: (A) change the direction of light travel (B) gather materials to scatter light. (C) avoid the absorption of light (D) grow bigger to stop light.

SOLUTION: C

PROBLEM: Article: A good memory is a great help in learning a language. Everybody learns his own language by remembering what he hears when he is a small child, and some children, like boys and girls who live abroad with their parents, seem to learn two languages almost as easily as one. In school it is not easy to learn a second language because the pupils have so little time for it, and they are busy with other subjects, too. A man's mind is rather like a camera, but it takes photos not only of what we see but of what we feel, hear, smell and taste. When we take a real photo with a camera, there is much to do before the photo is finished and ready to show to our friends. In the same way there is much work to be done before we can keep a picture forever in our mind. Memory is the diary that we all carry about with us.
Question: We usually begin to learn our own language by _ it.
Options: (A) speaking (B) hearing (C) saying (D) teaching

SOLUTION: B

PROBLEM: Article: What happens to mother-daughter relationships when girls become teenagers. It seems that girls go from playing "dress up", to arguing with their mothers about how they should dress. When a girl is 3-4 years old they love to "dress up" in their mothers' clothes, put on their mothers' makeup, cook, and do whatever else their mother does. This is the time when she can be classified as being a mama's girl. How come girls change so much from childhood to the teenage years? Many parents seek the answer when their daughter becomes a teen. Often when a girl enters high school her behavior changes as well as her physical appearance. When I was young I always liked playing "dress up". It made me feel older and more like my mother. Even when I entered middle school, I still depended a lot on my mother to choose and buy my clothes. Once I entered high school there was a big change. To me, my mother's clothes were no longer "in fashion", and neither was her opinion. I started becoming interested in boys and tried to improve the way I looked. It was not that I wanted to look cool, I just wanted to look my age. This is the time that the mother-daughter relationship can take a turn. It's difficult for a mother to know that her daughter is no longer totally dependent on her. When the daughter starts wearing revealing clothing, dating, and just wanting to be more independent, a mother starts to feel left out, or not needed. The number of arguments increases, and the number of times when the mother and daughter get along happily decreases. When these things start to happen, it is a sign that the daughter wants her independence and the freedom to grow up. When you notice how much your relationship had changed, try to believe positive things come out of the change. Put all the negatives aside and concentrate on what your mother is feeling instead of just on what you're feeling. When it seems too hard to handle, take some quiet time and write out your feelings. Maybe at another time, you can share them with your mother and try to find a way to better your relationship as mother and daughter. If you don't feel comfortable sharing your feelings, at least write them down so you can get them out. It's better than keeping them bottled up inside.
Question: The girls would argue with their mothers because _ .
Options: (A) they need more independence (B) mothers want daughters to be mama's girls again (C) they think their mothers' clothes are no longer in fashion (D) all of the above

SOLUTION:
D