According to the text,which of the following is NOT a historical significance of the excavation of bone flutes in the Jiahu area?
A.
It has challenged the belief that China's traditional music had only a five-tone scale.
B.
It has extended Chinese civilization by another 3,000 years.
C.
It provides new insights into China's music history.
D.
It indicates that bone musical instruments have disappeared in Han areas.