Question

Which feature of the Constitution was eventually created as a result of Anti-Federalists’ efforts?

Answer 1

I would say A. Bill of rights.

Answer 2

I choose letter B. provisions for State sovereignty.  Many anti-federalists are not in favor of the government encroaching on the rights of their states.  This came from their resentment of British rule where they were not represented in government.  This is why they want smaller governments to prevent their intervention in their respective states.