If the distribution of a construction is functionally equivalent to that of one or more of its constituents, the construction is called ______.

A．came from American’s hardworking
B．could be regarded as the reflection of black women’s hardship
C．reflected the insight ideas of men more than those of women
D．was mainly in Southern rural areas by the end of 19' century

A．It brought blues back to Europe
B．It spread blues to the world
C．The blues became shared by American soldiers both from south and north
D．It made the blues become the important element in abolishing segregation among American soldiers