C: Taft had the support of the northern Republican Conservatives
Based on this passage and what you have learned about the states, the states were unwilling to voluntarily work together in a confederation because each state had its own interests and needs.
Each state was in favor of proceeding their own interests and needs they believed that focusing on their needs would be a much better option in the long run. Unity wasn’t a wide practice during that era too.
Your answer is C. The Framers wanted to make sure that when parties rise, they will met the needs of the constitution.