They didn't want a monarchy like they had in Britain
They were the first people to use wheels
Domestic Tranquility means that there is peace, and no fighting/issues going on where you are living. It can have two different meanings though. It could also mean peace between the different states of a country. :) Hope I helped! For further details, I'd look into Google.
I believe the best option would be A because both compromises aimed to appease the growing friction between the north and south.