The main objection to the adoption of the United States Constitution was based primarily on the belief that

b. individual freedoms could be restricted by a strong central government .

Explanation:

The United States Constitution was created to replace the Articles of Confederation which had given the central/ federal government such little power that it was ineffective.

The Constitution therefore gave more power to the Federal Government but then some people were objected to this because they thought that power centralized in such a form could restrict individual freedoms.

A compromise was reached with the inclusion of the Bill of Rights in the US Constitution which would guarantee protection to the individual America.

The best and most correct answer among the choices provided by your question is the third choice or letter C. 

After the Congress of Berlin, Austria annexed Bosnia and Herzegovinia.
Congress of Berlin, (June 13–July 13, 1878), diplomatic meeting of the major European powers at which the Treaty of Berlin replaced the Treaty of San Stefano, which had been signed by Russia and Turkey (March 3, 1878) at the conclusion of the Russo-Turkish War of 1877–78.

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