According to the writer, what is the main reason why the book is so popular?
Result:
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Option 1: "The book contains some original ideas."
Explanation: The text states that the professor identified a gap in the market regarding 'green' businesses, which indicates that the book presents original ideas not covered in previous textbooks. This originality is a key factor in its popularity.
Option 2: "The author has a lot of teaching experience."
Explanation: While the author’s thirty years of teaching experience is mentioned, it does not directly explain why the book is popular. The focus is on the original ideas presented in the book, not solely on the author's experience.
Option 3: "The book deals with many different subjects."
Explanation: Although the text notes that the book covers a broad range of topics, this alone does not account for its popularity. The main reason highlighted is the originality of the ideas related to 'green' businesses.
Option 4: "The author is very good at explaining things."
Explanation: The text mentions that the author makes complicated subjects easy to understand, but this is not the primary reason for the book's popularity. The emphasis is on the original ideas that fill a market gap.
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