The Fact That 19th-Century Arguments About the Racial Inferiority of Non-Whites

The fact that 19th-century arguments about the racial inferiority of non-Whites are no longer accepted as true supports which of the following conclusions?

A) Race is an immutable biological characteristic.
B) Race can be scientifically validated through quantitative research.
C) Race is socially constructed because ideas dominant at one time in history are now rejected.
D) The civil rights movement did not change the reality of racial inequality.