A major concern of the Antifederalists was that a too- strong central government would ___. A. Weaken state power
B. Allow a President only one election
C. Protect individual freedom
D. Strength state power

. Weaken state power

Explanation:

Anti-federalist was a political movement that advocated for preventing the central government from having too much power.

The supporters of the anti-federalist believed that earlier draft of the constitution was created to maintain a healthy balance between the federal government and the independent states that can regulate their own matters.

If the power of federal government was increased, Anti-federalists believe that  the feds will have more chance to limit / overturn the decisions made by the states. As a result, the states will be weakened and gradually lost its independency.

d.summerains, the last one