Which Statement Is True About the Concept of Race in the United

Which statement is true about the concept of race in the United States in the nineteenth century?

A) Race was a vague notion; for example, the "Anglo-Saxon race" was defined largely as the opposite of being black, Hispanic, Indian, or Catholic.
B) U.S. aggression against Mexico, a sovereign republic, led most Americans to reject the idea that Anglo-Saxon Protestants were an innately liberty-loving race.
C) The concept of manifest destiny held that all races and cultures are equal.
D) The concept of race did not yet exist in the nineteenth century.
E) The concept of race had largely been discredited as merely a social construct.