In this task, you're given an article, a question which often contains a blank, four options (associated with "A", "B", "C", "D") and the answer to that question. Your task is to classify whether the given answer is correct or not by providing "Yes" or "No", based on the article.

Let me give you an example: Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Question: Researchers did experiments on kids in order to find out _ .
Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Answer: B
The answer to this example can be: Yes
Here is why: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. Hence, B is the correct answer and output is Yes.

OK. solve this:
Article: We all use money every day. It is essential because we can pay money for whatever we want.Money is recognized as banknotes and coins. However,many years ago people couldn' t go to the shop and buy what they wanted.They had to get what they wanted through the barter trade .It was really difficult,for the barter often depended on coincidence of wants.For example,the seller of grain has to find a buyer who wants to buy grain and who also could offer something the seller wants to buy.And one more example,if a wheat farmer needs what a fruit farmer produces,a direct exchange is impossible because seasonal fruit would spoil before the grain harvest.The solution is to trade fruit for wheat indirectly through a third intermediate commodity ,such as cattle,salt,shells,wine.However,commodity money had their disadvantages.For example,cattle,fur,precious stones couldn' t be cut into smaller pieces and it was inconvenient to keep and transport them.Thus coins were invented. The earliest known coins in the western world came from Lydia in about 650 B.C.Greek cities,the Great Persian Empire and Roman Empire quickly adopted the new useful technique of metal currency.And by the end of the 6th century,coinages were common throughout the region.However,coins as well as commodity money had many disadvantages.For instance,coins quickly show wear and they usually have small value,so it' s difficult to count large sums of coins. At first,paper money was used in China in about 650 A.D.After then,it was used in Persia and Japan.In Europe,paper money was firstly produced in the Netherlands in the 16th century and in the USA in the 17th century.Paper money is worthless but symbolic.In other words,paper money is just a note.It has a purchasing power because the government announces it as money and citizens accept it universally.
Question: The writer explains the difficulty of barter trade by _ .
Options: (A) telling stories (B) using examples (C) presenting a theory (D) making a comparison
Asnwer: C
Answer:
No