<em>The answer is A. You could add statement A to the claim 3 as a supporting sentence. </em>
The outline is a little bit unbalanced as regards the supporting ideas. I would eliminate sentence C from claim 3. It doesn't contribute to the claim's main idea and it's just a generalization but not an important piece of information.
Also, you could make a separate claim related to the government's role in a free enterprise system and use sentences C, D, and C (from the last part) to support it.
It may be admitted to the union to become a state after it's officers petition Congress for an enabling act, establish a constitution, and full a requirement of citizen/population. It will then be under Congress to make the decision to grant the territory a title of a state or not.
B is the answer because the Europeans were immune to the virus and the Indians weren't so they grew very ill which helped the Europeans.