Answer: It indicates that the aunt's portrayal of right and wrong is inauthentic and unconvincing
Step-by-step explanation:
The underlined sentence contribute to the theme that culture can limit our thinking as it indicates that the aunt's portrayal of right and wrong is inauthentic and unconvincing.
From the excerpt, despite the aunt saying good things about the girl such as she being truthful, polite and clean, she still said that the girl wasn't as pretty as the other girls. This showed that the aunt's portrayal of right and wrong is inauthentic and unconvincing.