Problem Statement

Which Books Flank Economics in the Stack of Seven Seven books, one each on Psychology, Hindi, English, Sociology, Economics, Education and Accountancy, are lying on a table one above the other. The following is known: I) Sociology is on the top of all the books. II) Accountancy is immediately below Education, which is immediately below Sociology. III) Economics is immediately above Psychology but is not in the middle. IV) Hindi is immediately below Psychology. Economics is between which of the following books?