In "mother tongue," how does amy tan demonstrate language bias toward her mother? a) she believed her mother's thoughts were unimportant because she expressed them imperfectly. b) she refused to go out with her mother in public because she was ashamed of her accent. c) she only spoke perfect standard english with her mother in an attempt to make her mother speak more clearly. d) she would not impersonate her mother on the phone when making important calls for her.