Since they have just gotten over war and money was good for one side but they had lack of money on the other side. From that case it was hard for them to agree over each other whether they could trade or not.
In the Revolutionary War, the colonial forces had multiple advantages. For one, they were fighting on their home turf, so they were more familiar with their surroundings. Also, they cared more about what they were fighting for - to the British, this was a dumb war they were being forced to fight so close to the 7 Year's War and they didn't really care about keeping some irrelevant colony. The colonial forces used guerrilla warfare to fight the British as well, which disrupted their traditional military style.
The answer is b i just took the test
They both work together, but separation of powers divides the branches and checks an balances helps ensure that one branch doesn't get too powerful or powerful than the other.