Out of those I’d choose Remorse because the others aren’t really synonyms for sorrow. Another word I’d use would be anguish.
Louisiana Purchase lied between the Mississippi River and the Rocky Mountains - Mississippi river was in the East and Rocky Mountains in the west, which means that the correct answer is "Rocky Mountains".
They are both natural borders: both are hard to attack and easy to defend, making them a natural border.
If you lay siege to the castle you don't risk the lives of your men and loss of equipment, You can just "wait it out" - the castle is going to run our of resources and likely surrender. So if you can afford to wait, laying siege is a better idea.
Answer B, holding elections. All the others are powers given to the national government.
THE ANSWERIS NOT D. Credit Card Accountability Responsibility and Discretion. It is most likely B. Credit Card Accountability Responsibility and Disclosure.