Final answer:
The excerpt from the dialogue between Mama and Walter most clearly conveys themes related to the struggle between maintaining one's dignity and conforming to societal expectations for economic benefits, aligning with option D.
Step-by-step explanation:
The excerpt most clearly conveys themes related to sacrifice, dignity, and societal expectations, specifically the tension between personal pride and the pressure to conform to society's norms for financial gain. Walter speaks about putting on a show to appease a white man who has the power to give them a substantial amount of money, reflecting a willingness to set aside personal dignity for economic benefits. Mama's response highlights the emotional and moral cost of such actions. This captures the essence of option D, which states that one should never sacrifice one's dignity; to meet society's expectations, one must give up one's individuality.