The correct answer is 2. Wolfgang Iser.
Explanation:
Wolfgang Iser is known for his significant contributions to literary theory and is particularly associated with reader-response criticism. His works, "The Implied Reader" and "The Act of Reading", focus on the role of the reader in interpreting texts and the concept of the "implied reader"—a hypothetical reader that the author has in mind when writing.
Roland Barthes, while a prominent literary theorist, is best known for his works like "The Death of the Author" and "S/Z," which focus more on textual analysis and the relationship between author and text rather than the reader’s role.
Stanley Fish is also a key figure in reader-response theory, but he is not the author of the specific works mentioned in your question. His focus is on the interpretive communities and how readers create meaning within the context of those communities.
Hans Robert Jauss is associated with reception theory and the concept of horizon of expectation, but he is not the author of the aforementioned works either.
Thus, the correct association of "The Implied Reader" and "The Act of Reading" with Wolfgang Iser makes answer 2 the right choice.