Mother’s approach was to memorize lists of polite phrases that would cover all possible social situations. She was constantly muttering things like “I’m fine, thank you. And you?” Once she accidentally stepped on someone’s foot, and hurriedly blurted, “Oh, that’s quite all right!” How does this excerpt support the main conflict of the story? A: It illustrates the challenges of understanding a new language and culture. B :It proves that mothers and daughters disagree about how to study. C :It suggests that careless behavior can cause injuries to others. D :It demonstrates the importance of manners in all cultures.