Do you know about a series of books that say they are for dummies? These American selfhelp books have been translated into more than thirtynine languages including Chinese, Arabic, Russian, French, German, Greek and Spanish. "Dummy" is a word for a stupid person. The dummy books are not really for stupid people. They are designed to show people how to do something they may never have tried before, like painting a house or learning a language. The books all say in a funny way that they are for dummies, such as WorldHistoryforDummies, RabbitsforDummies, ChineseCookingforDummies, andWeddingPlanningforDummies. The first such book,DOS forDummies, was published in 1991.It helped people learn how to use the DOS operating system for computers. Since then, more than one hundred and fifty million dummy books have been sold. The dummies.comwebsite explains the idea behind the books. It says that they show that people can be taught to do anything. First they can make fun of ideas that are difficult to understand. Then they show how the information can be interesting and easy. he publishers say that the books do not provide more information than necessary. They give readers just enough information to do what they want. They say that the dummy books give the best and easiest way to do something. And the books use simple and easy language. There are more than one thousand different dummy books. A report in NewYorkTimessays that the topselling dummy books are those that explain technology and personal finance. The publishers say that the bestselling dummy books are those providing information many people need--like information about diseases,education and cooking. People interested in opera,car repair and wine can also find dummy books to help them. And there are even more dummy books to come. The publishers say that they publish about two hundred new dummy books every year. The dummy books have been popular because  _  .
they provide just what is needed and are easy to understand they provide abundant information on the concerning subject people can learn to do anything with just one copy people can save lots of money through selfteaching
Question: Do you know about a series of books that say they are for dummies? These American selfhelp books have been translated into more than thirtynine languages including Chinese, Arabic, Russian, French, German, Greek and Spanish. "Dummy" is a word for a stupid person. The dummy books are not really for stupid people. They are designed to show people how to do something they may never have tried before, like painting a house or learning a language. The books all say in a funny way that they are for dummies, such as WorldHistoryforDummies, RabbitsforDummies, ChineseCookingforDummies, andWeddingPlanningforDummies. The first such book,DOS forDummies, was published in 1991.It helped people learn how to use the DOS operating system for computers. Since then, more than one hundred and fifty million dummy books have been sold. The dummies.comwebsite explains the idea behind the books. It says that they show that people can be taught to do anything. First they can make fun of ideas that are difficult to understand. Then they show how the information can be interesting and easy. he publishers say that the books do not provide more information than necessary. They give readers just enough information to do what they want. They say that the dummy books give the best and easiest way to do something. And the books use simple and easy language. There are more than one thousand different dummy books. A report in NewYorkTimessays that the topselling dummy books are those that explain technology and personal finance. The publishers say that the bestselling dummy books are those providing information many people need--like information about diseases,education and cooking. People interested in opera,car repair and wine can also find dummy books to help them. And there are even more dummy books to come. The publishers say that they publish about two hundred new dummy books every year. The dummy books have been popular because  _  .
A. they provide just what is needed and are easy to understand
B. they provide abundant information on the concerning subject
C. people can learn to do anything with just one copy
D. people can save lots of money through selfteaching
Answer: