Seven books are placed one above the other in a particualr way. History book is placed exactly above Civics book. Geography book is fourth from the bottom and English book is fifth from the top. There are two books in between Civics and Economics books. How many books are there between Civics and Science books ? To answer this question, which other extra information is required, if any, from the following ?

• A. There are two books between Geography and Science books
• B. There are two books between Mathematics and Geography books.
• C. There is one book between English and Science books.
• D. The Civics book is before two books above Economics book.