I literally don't have any exact answers, so dm me or smth if this is wrong with A B C D or smth, but here:
During reconstruction, former confederate generals were unsupportive and extremely racist. Northern troops had to be sent to the south to enforce new anti-racist laws and delay the forming of Black Codes and Jim Crow laws. But still, The Ku Klux Klan formed, and Black Codes and Jim Crow laws formed with it once northern troops were sent away.
They used dry farming and flood irrigation.
The correct answer is:
Monarchs had to respect certain basic rights of citizens.
The Magna Carta, Magna Carta Libertatum (latin) which means "The Great Charter" is a charter issued by King John of England, which established for the first time that everybody, including the king should obey the law. It basically was the start of protecting the rights of the citizens, and limited the monarchs power. This charter was created to deal with the political crisis in 1215.
The correct answer choice would be B.
Hope this helps and thanks for using brainly!