The "Anthropology Applied" Story About Building Houses for Apache Indians

The "Anthropology Applied" story about building houses for Apache Indians reveals what?​

A) ​The Apache have no sense of etiquette or table manners because their cooking and living areas are not separated.
B) ​The United States should try to make its subcultures more like mainstream culture.
C) ​Participant observation has no practical purposes.
D) ​Cultural and social patterns of behavior can be unconscious, but they have an impact on how we live and use space.