Final answer:
The flashback in Lorraine Hansberry's play illuminates Beneatha's childhood idealism and empathy, contrasting with her current disillusionment.
Step-by-step explanation:
The flashback in line 9 ("When I . . . face") from Lorraine Hansberry's play "A Raisin in the Sun" highlights Beneatha's past idealism and empathy, showcasing b. idealism and empathy she once possessed. This memory of her childhood explains her dream of becoming a doctor to help people, akin to how someone helped Rufus after his accident. The trauma of her brother's financial loss brings a sense of disillusionment contrasting sharply with her childhood aspirations and underscores the poignancy of her current state.