Question

what was the one-drop rule?
a. a southern rule based on scientific racism
b. a supreme court decision about race
c. a constitutional amendment about segregation
d. a railroad company rule about drinking

Explanation:

The one - drop rule was a social and legal principle in the Southern US, rooted in scientific racism (the false idea of racial "purity" and hierarchy). Option B: The one - drop rule wasn't a Supreme Court decision. Option C: It wasn't a constitutional amendment. Option D: It had nothing to do with railroad drinking rules. So the correct option is A.

Answer:

A. A Southern rule based on scientific racism