They tried their best to keep their cultural______ intact.

A．it is the printed version of standardized folk music
B．it encourages people to popularize printed versions of songs
C．it tends to standardize folk songs when it is used by folk musicians
D．it has a great effect on the music-culture as more and more people are able to read it

A．Folk songs cannot be spread far unless they are printed on music sheets.
B．Music cannot be passed on to the future generations unless it is recorded.
C．The development of music culture is highly dependent on its material aspect.
D．Musical instruments developed through the years will sooner or later be replaced by computers.