Read this portion of an outline from a passage.
I. Print books and E-books
A. Print Books
1. Physicality of print books
2. Environmental friendliness of print books
3. Cost of print books
4. Convenience of print books
B. E-books
1. Physicality of e-books
2. Environmental friendliness of e-books
3. Cost of e-books
4. Convenience of e-books
What are the points of comparison used in this passage?
the passage first talks all about books printed on paper and then all about e-books
physicality, environmental friendliness, cost, and convenience
weightlessness, ease of transport, and ease of use
the history of all books, the history of digital books, and the history of print books