Which is an example of nonmaterial culture?

A. A book about where people live

B. An elementary school building

C. A painting of a city scene

D. An idea about how to be polite

I would say C. A painting of a city scene because non-material is t houghts or ideas that make up a culture are called the non-material culture. I say its C because all the other answers aren't thought or ideas about culture and painting is your thoughts and ideas about something.