Why does the author likely include the quote from Tarbell?

The author likely includes the quote from Tarbell to emphasize Tarbell's commitment to fairness. This choice highlights the ethical standards that Tarbell upheld in her writing and investigative journalism, showing that she valued objectivity and the pursuit of truth. By focusing on fairness, the author aligns Tarbell's principles with the broader theme of integrity in writing, suggesting that her approach to journalism was one rooted in a desire to present facts rather than merely to entertain or sensationalize.

In contrast, the other options lack the depth of this reasoning. While Tarbell's educational background might be relevant, it does not directly speak to her character or values as a journalist. Providing context for her views could be important, but it doesn't specifically address her commitment to fairness, which is the core of this choice. Criticizing her potential biases suggests a negative connotation that likely contradicts the author’s intention to celebrate Tarbell's legacy and contributions to journalism.