The correct answer is 3. The reader gets background information that Helen might not have known about or experienced.
In "The Miracle Worker," the dialogue between Anagnos and Annie provides context about Annie's own past and the challenges she faces, as well as insight into Helen's situation and the anticipation of her arrival at the Perkins Institution. This background may not be something Helen herself is fully aware of, particularly since she is depicted as locked in her own world.
In contrast, "The Story of My Life" presents Helen's own narrative, offering her perspective and experiences directly. Thus, while readers gain a deeper understanding of Helen's context through Anagnos's conversation, this information may not be accessible to Helen herself.