Queen Isabella and King Ferdinand
Answer: Appropiate
Explanation: "Dark Ages" is indeed appropiate because the religious people burnt down all the previous knowledge of Romans, such as mathematics, physics, philosophy, etc. All because they wanted everyone to follow "God" and their whole catholic church, so if people were to read all this knowledge, specially the philosophical and religious knowledge that Romans wrote, no one would've gone with the catholic church and believe it.
Racism was very common back in the day. Black people were considered “inferior” to white people because of their skin. Influences came from a long time after slavery went on.
Finally, something that I study in Australia; The answer is B.