It's between A and B. The articles of confederation made the federal government weak and pretty much non-existent in terms of true power. Effectively each state was its own country more or less.
I think A and B sound pretty identical though perhaps choice A isn't the best answer because each state didn't really think about the country as a whole, but rather focused on their own backyard.
So that's why I'm thinking the final answer is choice B
Though I would get a second opinion on the matter.