Margarine and butter are examples of substitutes.
Hmmm. I'd like to say 2 (B & D) I think I'll choose B :D
Democracy was created by humans to give us order and strict government. This text is saying there were other options before that. (I have taken a political science class) and an example of another option could be fulfilling Locke’s State Of Nature (where humans are just humans with no laws or boundaries). Democracy is not inevitable because there were other unexplored options before it.
If Missouri became a free State the balance of power who have definitely been shifted but the Missouri Compromise kept. the Union together for more than 30 years
The Volga River
I hope this helped :)