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Practice one SAT question at a time

Questions come from the Bluebook question bank.

In 2023 literary scholar Jeremy Douglass cautioned technology investors and enthusiasts who predict conventional books’ ultimate displacement by newer forms of media. Douglass observed that the concept of an “interactive” text is much older than technologists assume, extending back to the first time readers scratched notes into a text’s margins. In addition, newer media, such as video games, haven’t replaced older forms of entertainment, such as comic books, but rather exist alongside them. Douglass believes that rather than supplanting books, technology is simply making new forms of expression possible.

Which choice best describes the function of the underlined portion in the text as a whole?