Which of the following is most responsible for making Life on the Mississippi a great example of American Realist writing?

A.
Twain's objective commentary

B.
Twain's unbiased descriptions

C.
Twain's imaginative characters

D.
Twain's use of idioms

A. Twain's objective commentary

To determine which of the options is most responsible for making "Life on the Mississippi" a great example of American Realist writing, we need to understand the characteristics of American Realism and identify which option aligns with those characteristics.

American Realist writing emerged in the late 19th century and aimed to depict everyday life and its struggles with accuracy and attention to detail. It sought to present life as it is, without romanticizing events or characters. Realist writers often focused on social, political, and economic issues of the time.

Option A suggests that Twain's objective commentary is the most responsible for making the book a great example of American Realist writing. Objective commentary refers to the author's unbiased and impartial observations about the events and characters in the story.

Option B states that Twain's unbiased descriptions are most responsible for the book's categorization as American Realist writing. Unbiased descriptions involve presenting the details of people, places, and events without any personal bias or judgment.

Option C suggests that Twain's imaginative characters contribute to making the book a great example of American Realist writing. Imaginative characters, on the other hand, focus more on creativity and imagination rather than the realistic depiction of everyday life.

Option D states that Twain's use of idioms is the most responsible for the book being considered American Realist writing. Idioms are phrases that have a figurative meaning different from their literal interpretation. While idioms can add depth to writing, they are not necessarily a defining characteristic of American Realism.

Based on these explanations, options A and B align most closely with the characteristics of American Realist writing. Both objective commentary and unbiased descriptions allow Twain to present "Life on the Mississippi" in an accurate and realistic manner. However, option B specifically mentions "unbiased descriptions" and is a more precise and accurate choice. Therefore, option B, Twain's unbiased descriptions, is the most responsible for making "Life on the Mississippi" a great example of American Realist writing.