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.

[EX Q]: Article: Wild elephants live in herds of 10 to about 50. The leader is usually a female. A herd can go through a forest quietly. It travels in a single line. It goes about 6 miles an hour. When frightened, it may run at about 25 miles an hour. When they reach water, elephants swim across. They are great swimmers. Elephants eat grass, leaves, small branches, and bark. They particularly like the tender leaves on the top of trees. How do they get these leaves? They use their heads to knock trees down. They can easily knock down a 30-foot tree. Elephants also eat berries, mangoes, coconuts, corn, and sugar cane. They love salt. A wild male adult eats 500 to 600 pounds of food a day. Many people want to find the graveyards of elephants. There is a strong belief that such graveyards exist. Here is why. Bones and tusks of dead elephants have almost never been found. Searches have been made in forests. Grassy plains have been searched too. But neither bones nor tusks are found. Elephants don't live forever. Where are their bones? They don't just bury themselves. Here is one belief. When an elephant gets sick or old, it instinctively knows death is near. It leaves the herd. It goes off to a secret graveyard. The place is known only to elephants, and perhaps other animals, but not to humans. Obviously, such a graveyard would be filled with tusks. These were once very valuable. The objective of explorers was to find this "gold" mine. This graveyard belief may be a truth or a myth. But it is romantic. It would be nice if it were true.
Question: An elephant usually travels at a speed of _ per hour.
Options: (A) around 6 miles (B) around 25 miles (C) no more than 6 miles (D) more than 25 miles
[EX A]: A

[EX Q]: Article: Supply and demand is perhaps one of the most basic concepts of economics and it is the backbone of a market economy. Demand refers to how much of a product or service is desired by buyers. The quantity demanded is the amount of a product people are willing to buy at a certain price; the relationship between price and quantity demanded is known as the demand relationship. Supply represents how much the market can offer. The quantity supplied refers to the amount of a certain goods producers are willing to supply when receiving a certain price. The relationship between price and how much of a goods or service is supplied to the market is known as the supply relationship. Price, therefore, is a reflection of supply and demand. The law of demand states that, if all other factors remain equal, the higher the price of a product, the fewer people will demand that product. The amount of goods that buyers purchase at a higher price is less as the price of a product goes up, so does the opportunity cost of buying that product. Like the law of demand, the law of supply shows the quantities that will be sold at a certain price. But unlike the law of demand, the supply relationship shows an upward slope. This means that the higher the price, the higher the quantity supplied. Producers supply more at a higher price because selling a higher quantity at a higher price increases the whole income. Now that we know the laws of supply and demand, let's turn to an example to show how supply and demand affect price. Imagine that a CD of your favorite band is sold for $20. Because the record company's previous analysis showed that consumers will not demand CDs at a price higher than $20, only ten CDs were sold because the opportunity cost is too high for suppliers to produce more. If, however, the ten CDs are demanded by 20 people, the price will then rise. As a result, the rise in price should cause more CDs to be supplied as the supply relationship shows that the higher the price, the higher the quantity supplied. If, however, there are 30 CDs produced and demand is still at 20, the price will not be pushed up because the supply is more than the demand.
Question: We know from the passage that changes in the prices of product cause changes in _ .
Options: (A) income and expense (B) invention and production (C) market and society (D) supply and demand
[EX A]: D

[EX Q]: Article: 56yearold becomes 1st woman to swim Atlantic (AP)-Jennifer Figge pressed her toes into the Caribbean sand, excited and exhausted as she touched land this week for the first time in almost a month. Reaching a beach in Trinidad, she became the first woman on record to swim across the Atlantic Ocean--a dream she'd had since the early 1960s,when a stormy transAtlantic flight got her thinking she could wear a life vest and swim the rest of the way if needed. The 56yearold left the Cape Verde Islands off Africa's western coast on Jan.12,2009, swimming 19 out of 25 days battling waves of up to 30 feet.The distance from Cape Verde to Trinidad is about 700 miles.Crewmembers are still computing exactly how many miles she swam. The original plan was for her to swim to the Bahamas--a distance of about 2,100 miles--but inclement weather forced her to change her plans and she arrived at Trinidad on Feb.5.She now plans to swim from Trinidad to the British Virgin Islands,ending her voyage at the Bitter End Yacht Club in late February. Her journey came a decade after French swimmer Benoit Lecomte made the first known solo transAtlantic swim,covering nearly 4,000 miles from Massachusetts to France in 73 days.No woman on record had made the crossing. Figge wore a red cap and wet suit,with her only goodluck charm underneath:an old,red shirt to guard against chafing ,signed by friends,relatives and her father,who recently died.The other cherished possession she kept onboard was a picture of Gertrude Ederle,an American who became the first woman to swim across the English Channel."We have a few things in common,"Figge said,"She wore a red hat and she was of German descent .We both talked to the sea,and neither one of us wanted to get out."
Question: When did Jennifer Figge want to swim across the Atlantic Ocean?
Options: (A) After she reached a beach in Trinidad. (B) After she pressed her toes into the Caribbean sand. (C) After her stormy transAtlantic flight in the early 1960s. (D) After her graduation from a university.
[EX A]:
C