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.

Input: Consider Input: Article: Many of the world's pollution problems have been caused by the crowding of large groups of people into the cities. Supply for the needs of the people leads to further pollution by industry. If the rapid increase of world population in countries continues at the present rate, there may be much greater harm to human beings. Some scientists speak of the increase in numbers of people as "population pollution." About 2,000 years ago, the world population was probably about 250 million. It reached a billion in 1850. By 1930 the population was two billion. It is now three and a half billion. It is expected to double by the year 2,000. If the population continues to grow at the same rate, there will be 25 billion in the world a hundred years from now. Man has been using the earth's resources more and more rapidly over the past years. Some of them are almost used up. Now many people believe that man's greatest problem is how to control the growth of the population. The material supplies in the world will be far from enough to support the human population in time to come, if the present rate of increase continues. Already there is overcrowding in many cities and starvation in some countries. Should man's population keep on growing so rapidly as before? Many people believe that human survival in the future depends on the answer to this question.
Question: The rapid increase in population is considered to be _ .
Options: (A) the increase of resources (B) population pollution (C) the development of mankind (D) the present rate

Output: B

Input: Consider Input: Article: Trees are useful to man in three important ways: They provide him with wood and other products; they provide him shade;. and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert. Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire .It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation .
Question: The most important service of trees to man is that _ .
Options: (A) they give them wood and other products (B) they give them shade (C) they help him prevent droughts and floods (D) they help him made money

Output: C

Input: Consider Input: Article: Downloading music over the Internet is pretty common among high school and college students. However, when students download and share copyrighted music without permission, they are against the law. A survey of young people's music ownership has found that teenagers and college students have an average of more than 800 illegally copied songs each on their digital music players.Half of those surveyed share all the music on their hard drive , enabling others to copy hundreds of songs at any one time. Some students were found to have randomly linked their personal blogs to music sites, so as to allow free trial listening of copyrighted songs for blog visitors, or adopted some of the songs as the background music for their blogs. Such practices may be easy and free, but there are consequences. Sandra Dowd, a student of Central Michigan University, was fined US$7,500 for downloading 501 files from LimeWire, a peer-to-peer file sharing program. Sandra claimed that she was unaware that her downloads were illegal until she was contacted by authorities. Similarly, Mike Lewinski paid US$4,000 to settle a lawsuit against him for copyright violation . Mike expressed shock and couldn't believe that this was happening to him. "I just wanted to save some money and I always thought the threat was just a scare tactic ." "You know, everyone does it," added Mike. The RIAA (Recording Industry Association of America), the organization that files lawsuits against illegal downloaders, states that suing students was by no means their first choice. Unfortunately, without the threat of consequences, students are just not changing their behavior. Education alone is not enough to stop the extraordinary growth of the illegal downloading practice.
Question: Why is it common for students to download copyrighted music?
Options: (A) They don't think that they will be caught. (B) They want their friends to know that they are smart. (C) They think it is a good way to make some extra money. (D) They are against copyright protection over Internet music.
Output: A